Approximately 7.98 grams of silver chromate will precipitate when 150 mL of 0.500 M silver nitrate is added to 100 mL of 0.400 M potassium chromate.
To determine the amount of silver chromate that will precipitate when 150 mL of 0.500 M silver nitrate is added to 100 mL of 0.400 M potassium chromate, we need to identify the limiting reagent and calculate the corresponding amount of silver chromate formed.
First, we can calculate the number of moles of silver nitrate and potassium chromate using their respective concentrations and volumes:
Moles of silver nitrate = concentration × volume = 0.500 M × 0.150 L = 0.075 mol
Moles of potassium chromate = concentration × volume = 0.400 M × 0.100 L = 0.040 mol
From the balanced chemical equation:
2 AgNO3 + K2CrO4 → Ag2CrO4 + 2 KNO3
We can see that the stoichiometric ratio between silver nitrate and silver chromate is 2:1. Therefore, the moles of silver chromate formed will be half the moles of silver nitrate used:
Moles of silver chromate formed = 0.075 mol / 2 = 0.0375 mol
Finally, we can calculate the mass of silver chromate using its molar mass:
Mass of silver chromate = moles × molar mass = 0.0375 mol × (2 × 107.87 g/mol) = 7.98 g
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You have a sample of sulfuric acid with an unknown concentration and you perform a titration with sodium hydroxide to determine the concentration.Your titration data for one trial is below:
Initial burette reading (cm3)
10.20
Final burette reading (cm3)
20.55
The volume of acid used in each titration is 10.00 cm3 and the concentration of NaOH used is 0.1000 mol dm−3.
Determine the concentration of the sulfuric acid in mol dm−3. Round your answer to four significant figures
The concentration of sulfuric acid is approximately 5.000 × 10⁻³ mol/dm³.
To determine the concentration of sulfuric acid, we can use the concept of stoichiometry and the volume and concentration data from the titration.
The balanced chemical equation for the reaction between sulfuric acid (H₂SO₄) and sodium hydroxide (NaOH) is:
H₂SO₄ + 2NaOH -> Na₂SO₄ + 2H₂O
From the equation, we can see that one mole of sulfuric acid reacts with two moles of sodium hydroxide.
Given that the volume of sodium hydroxide used in the titration is 10.00 cm³ and its concentration is 0.1000 mol/dm³, we can calculate the number of moles of sodium hydroxide used:
moles of NaOH = volume × concentration = 10.00 cm³ × 0.1000 mol/dm³ = 1.0000 × 10⁻³ mol
Since the stoichiometric ratio between sulfuric acid and sodium hydroxide is 1:2, the number of moles of sulfuric acid is half of the moles of sodium hydroxide:
moles of H₂SO₄ = 1/2 × moles of NaOH = 1/2 × 1.0000 × 10⁻³ mol = 5.0000 × 10⁻⁴ mol
Now, we can calculate the concentration of sulfuric acid:
concentration of H₂SO₄ = moles/volume = 5.0000 × 10⁻⁴ mol / 10.00 cm³ = 5.0000 × 10⁻³ mol/dm³
Rounding to four significant figures, the concentration of sulfuric acid is approximately 5.000 × 10⁻³ mol/dm³.
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₂H5OH (1) + 302(g) → 2CO₂(g) + 3H₂O(g)
1.25 mol C2H5OH reacts with
excess oxygen. What volume of
CO2 gas is produced at STP
during the reaction?
14 liters of [tex]CO_{2}[/tex] gas would be produced at STP during the reaction.\
To find the volume of [tex]CO_{2}[/tex] gas produced at STP (Standard Temperature and Pressure) during the reaction, we can use the concept of molar volume and stoichiometry.
Given:
1.25 mol [tex]C_{2}H_{5}OH[/tex] (ethanol)
From the balanced equation:
2 [tex]C_{2}H_{5}OH[/tex] + 3 O2 → 2 [tex]CO_{2}[/tex] + 3 H2O
According to the stoichiometry of the reaction, 2 moles of [tex]C_{2}H_{5}OH[/tex] produce 2 moles of CO2.
So, 1.25 moles of [tex]C_{2}H_{5}OH[/tex] will produce (1.25 mol [tex]CO_{2}[/tex] / 2 mol [tex]C_{2}H_{5}OH[/tex]) = 0.625 moles of [tex]CO_{2}[/tex].
Now, we can use the ideal gas law to calculate the volume of [tex]CO_{2}[/tex] gas at STP.
At STP, the conditions are 0 degrees Celsius (273 K) and 1 atm pressure.
The molar volume of a gas at STP is 22.4 L/mol.
Therefore, the volume of [tex]CO_{2}[/tex] gas produced at STP can be calculated as:
Volume of [tex]CO_{2}[/tex] gas = (0.625 mol [tex]CO_{2}[/tex]) * (22.4 L/mol)
Volume of [tex]CO_{2}[/tex] gas = 14 L
Hence, 14 liters of [tex]CO_{2}[/tex] gas would be produced at STP during the reaction.
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The volume of CO₂ gas produced when 1.25 moles of C₂H₅OH reacts with excess oxygen at standard temperature and pressure is 56 liters.
Explanation:The question is one about stoichiometry, which is a part of chemistry that deals with the quantitative relationship between reactants and products in a chemical reaction. According to the balanced chemical equation provided, every mole of C₂H₅OH produces 2 moles of CO₂. Therefore, if you have 1.25 moles of C₂H₅OH, you would produce 2 ×1.25 moles of CO₂, which is 2.5 moles.
At STP (standard temperature and pressure), one mole of any gas occupies a known volume of 22.4 liters. So, the volume of 2.5 moles of CO₂ at STP would be 2.5 × 22.4 L, which comes to 56 L.
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In one to two sentences, explain why metal is often used for making wire and the properties that make metal useful. text format please
Metals are often used for making wire because they have high electrical conductivity, allowing for efficient transmission of electricity, and they possess malleability and ductility.
What is electrical conductivityElectrical conductivity refers to the ability of a material to conduct electric current. It is a measure of how easily electrons can flow through a substance when an electric potential difference (voltage) is applied across it.
Materials with high electrical conductivity allow electric charges to move freely while materials with low electrical conductivity impede the flow of electric current.
Metals are known for their high electrical conductivity which makes them excellent conductors of electricity.
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from a consideration of the masses of water measured in part c, and given that the density of water is 1 glml, which is the most ac€urate method of volume measurement--cylinder, pipet, or buret
The most accurate method of volume measurement among a cylinder, pipet, and buret can be determined by considering the masses of water measured.
To determine the most accurate method of volume measurement, we need to compare the measured masses of water using the different instruments and consider the density of water, which is 1 g/mL.
The density of water tells us that 1 mL of water has a mass of 1 gram. If the measured masses of water using the instruments are close to the expected values based on the density of water, it suggests that the instrument provides accurate volume measurements.
For example, if the measured mass of water using the cylinder is very close to the expected mass based on the volume calculated using the density of water, then the cylinder can be considered an accurate method of volume measurement. Similarly, if the measured masses using the pipet or buret are close to the expected values, then those instruments can be considered accurate as well.
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#6. Which of the following identifies the element(s) as being oxidized and reduced in the reaction? 2 H2O2(aq) → 2 H2O(1)+ O2(g) O Hydrogen is oxidized and oxygen is reduced. O Oxygen is oxidized and hydrogen is reduced. O Oxygen is both oxidized and reduced. O No elements are oxidized or reduced the reaction is not a redox reaction.
The statement " Oxygen is oxidized and hydrogen is reduced" identifies the element(s) as being oxidized and reduced in the reaction.
What is oxidation?Oxidation represents a chemical transformation entailing the relinquishment of electrons. Within an oxidation reaction, a certain entity forfeits electrons to another entity. The entity undergoing electron deprivation is referred to as oxidized, while the entity acquiring electrons is labeled as reduced.
Oxidation possesses the potential to be advantageous, serving purposes such as energy generation or the decomposition of detrimental substances. Nevertheless, oxidation may also manifest as a deleterious phenomenon, provoking the corrosion of metals or the decay of edibles.
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The pressure of the H2 gas is increased in the cathode compartment.
The emf of the cell will increase.
The emf of the cell will decrease.
The effect of increasing the pressure of H2 gas in the cathode compartment on the electromotive force (emf) of the cell depends on the type of cell being considered.
In a hydrogen fuel cell, where hydrogen is oxidized at the anode and combined with oxygen at the cathode to produce water, increasing the pressure of H2 gas in the cathode compartment will have no direct effect on the emf of the cell. The emf of a hydrogen fuel cell is primarily determined by the redox reactions occurring at the anode and cathode, as well as the electrochemical potentials of those reactions. Therefore, increasing the pressure of H2 gas in the cathode compartment will not cause a change in the emf of the cell. On the other hand, if we consider a concentration cell, where the emf is based on the difference in concentration between the anode and cathode compartments, increasing the pressure of H2 gas in the cathode compartment would result in an increase in the emf of the cell. This is because the increased pressure would cause a higher concentration of H2 gas in the cathode compartment, leading to a greater concentration gradient between the anode and cathode compartments and thus an increased emf.
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Which factor or factors are responsible for the timing and severity of the ages that occurred over the past 800,000 numerous ice years? a. Changes solar fcrcing cnly b. Changes in CO2 levels only c. Changes in solar forcing amplified by changes in CO2 levels d. Very large volcanic eruplions
The correct answer is c. Changes in solar forcing amplified by changes in [tex]CO_2[/tex] levels.
The timing and severity of ice ages over the past 800,000 years are influenced by multiple factors, but the most significant factors are changes in solar forcing (variations in the amount of solar radiation reaching Earth) and changes in [tex]CO_2[/tex] levels. These two factors work together in a feedback loop.
Changes in solar forcing alone, such as variations in Earth's orbit and tilt, can cause fluctuations in the amount of solar energy received by the planet. However, the effect of these changes alone is not sufficient to explain the timing and severity of ice ages.
On the other hand, changes in [tex]CO_2[/tex]levels also play a crucial role. [tex]CO_2[/tex] is a greenhouse gas that helps trap heat in the Earth's atmosphere. When [tex]CO_2[/tex] levels increase, it enhances the greenhouse effect and leads to a warmer climate. Conversely, lower [tex]CO_2[/tex]levels can contribute to cooler climates.
In the context of ice ages, changes in solar forcing can initiate a cooling trend, but the effect is amplified by changes in [tex]CO_2[/tex] levels. When solar forcing initiates cooling, it leads to a decrease in temperature, which reduces the capacity of the oceans to hold [tex]CO_2[/tex]. This, in turn, causes [tex]CO_2[/tex] levels to drop further, reinforcing the cooling trend and contributing to the severity and duration of ice ages.
Therefore, the combination of changes in solar forcing amplified by changes in [tex]CO_2[/tex] levels is responsible for the timing and severity of ice ages over the past 800,000 years.
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you add 100 ml of 0.10 m hcl to 100 ml of 0.50 m phosphate (h2po4-; pka = 2.148). what is the ph of this solution? ph =
The pH of the solution after adding 100 ml of 0.10 M HCl to 100 ml of 0.50 M phosphate (H2PO4-; pKa = 2.148) can be calculated using the Henderson-Hasselbalch equation and the acid dissociation constant (Ka) values for phosphoric acid. The pH of this solution is 2.148.
The balanced chemical equation for the reaction between HCl and H2PO4- can be written as follows: H2PO4- + H+ ⇌ H3PO4Since the acid dissociation constant (Ka) for H3PO4 can be written as: Ka = [H+][H2PO4-] / [H3PO4]Ka = 6.2 × 10-3 / [H3PO4]At the midpoint of the reaction, where the concentrations of [H2PO4-] and [HPO42-] are equal, the pH of the solution can be calculated using the Henderson-Hasselbalch equation: pH = pKa + log ([HPO42-] / [H2PO4-])At the midpoint, [HPO42-] = [H2PO4-]
Therefore, pH = pKa + log (1) = pKa = 2.148Therefore, at the midpoint of the reaction, the pH of the solution is 2.148. The pH of this solution is 2.148.
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What is the heat of vaporization of a substance if 10,776 cal are required to vaporize 5.05 g? Express your final answer in joules per gram.
The heat of vaporization of the substance is approximately 8,922.982 joules per gram.
To calculate the heat of vaporization (ΔHvap) of a substance, we need to use the formula:
ΔHvap = q / m
where q is the heat energy required for vaporization and m is the mass of the substance.
Given that 10,776 cal (calories) are required to vaporize 5.05 g, we first need to convert the heat energy from calories to joules since the final answer should be in joules per gram.
1 cal = 4.184 J
So, 10,776 cal = 10,776 * 4.184 J = 45,043.184 J
Now we can calculate the heat of vaporization:
ΔHvap = 45,043.184 J / 5.05 g
ΔHvap ≈ 8,922.982 J/g
Therefore, the heat of vaporization of the substance is approximately 8,922.982 joules per gram.
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he heat of vaporization of benzene is . calculate the change in entropy when of benzene boils at . be sure your answer contains a unit symbol. round your answer to significant digits.
The change in entropy when benzene boils at 80.1 °C is 0.087 kJ/(mol·K).
Given data:
The heat of vaporization of benzene, ΔHvap = 30.8 kJ/mol
Boiling point of benzene, T = 80.1 °C = 353.25 K
The change in entropy (ΔS) when benzene boils can be calculated using the formula:
ΔS = ΔHvap / T
Substituting the given values, we get:
ΔS = (30.8 kJ/mol) / (353.25 K) = 0.0871 kJ/(mol·K)
Round off the answer to significant digits and include the unit symbol, we get:ΔS = 0.087 kJ/(mol·K)
Therefore, the change in entropy when benzene boils at 80.1 °C is 0.087 kJ/(mol·K).
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write a balanced chemical equation for the standard formation reaction of solid sodium carbonate na2co3.
The balanced chemical equation for the standard formation reaction of solid sodium carbonate ([tex]Na_{2}CO_{3}[/tex]) can be written as:
2 Na(s) + [tex]CO_{2}[/tex](g) + 1/2 [tex]O_{2}[/tex](g) → [tex]Na_{2}CO_{3}[/tex](s)
This equation represents the formation of one mole of solid sodium carbonate ([tex]Na_{2}CO_{3}[/tex]) from its constituent elements under standard conditions.
The reaction involves the combination of sodium (Na) with carbon dioxide ([tex]CO_{2}[/tex]) and oxygen ([tex]O_{2}[/tex]) to form the sodium carbonate compound.
In this reaction, two moles of sodium (Na) react with one mole of carbon dioxide ([tex]CO_{2}[/tex]) and half a mole of oxygen ([tex]O_{2}[/tex]) to produce one mole of solid sodium carbonate ([tex]Na_{2}CO_{3}[/tex]).
The coefficients in the balanced equation ensure that the number of atoms of each element is equal on both sides of the reaction.
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only 0.015 l of a 0.880 m barium nitrate solution is available to mix with 0.024 l sample of a 1.36 m potassium sulfate solution. the precipitate baso4 is centrifuged, collected, dried, and found to have a mass of 2.52 g . what are the theoretical yield, and the percent yield. (answer: 3.08 g, 81.8%)
Only 0.015 l of a 0.880 m barium nitrate solution and 0.024 l of a 1.36 m potassium sulfate sample are available for mixing. The precipitate BaSO₄ has a mass of 2.52 g after being centrifuged, collected, and dried. The percent yield is about 81.8%, and the theoretical yield is 3.08 g.
To calculate the theoretical yield and percent yield, we first need to determine the limiting reactant. The limiting reactant is the one that is completely consumed and determines the maximum amount of product that can be formed.
Let's calculate the moles of barium nitrate (Ba(NO₃)₂) and potassium sulfate (K₂SO₄) using their respective concentrations and volumes:
Moles of Ba(NO₃)₂ = 0.015 L × 0.880 mol/L = 0.0132 mol
Moles of K₂SO₄ = 0.024 L × 1.36 mol/L = 0.03264 mol
Now, we can compare the moles of the two reactants to determine the limiting reactant.
Ba(NO₃)₂:K₂SO₄ ratio = 0.0132 mol : 0.03264 mol ≈ 1 : 2.47
Since the ratio is approximately 1:2.47, it means that Ba(NO₃)₂ is the limiting reactant. Therefore, the amount of BaSO₄ formed will be determined by the moles of Ba(NO₃)₂.
To calculate the theoretical yield of BaSO₄, we need to convert the moles of Ba(NO₃)₂ to grams of BaSO₄ using the molar mass:
Molar mass of BaSO₄ = 137.33 g/mol (from periodic table)
Theoretical yield of BaSO₄ = 0.0132 mol × 233.39 g/mol = 3.08 g
Now, we can calculate the percent yield by dividing the actual yield (2.52 g) by the theoretical yield (3.08 g) and multiplying by 100:
[tex]\begin{equation}\text{Percent yield} = \frac{2.52 \text{ g}}{3.08 \text{ g}} \times 100\% \approx 81.8\%[/tex]
Therefore, the theoretical yield is 3.08 g and the percent yield is approximately 81.8%.
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triphenyl mehtane readily undergoes autooxidation to produce hydroperoxide.
a) draw the expected hydroperoxide.
b) explain why triphenylmethane is so susceptible to autooxidation.
c) in the presence of phenol( C6H5OH), triphenylmehtane undergoes autooxidation at much slower rate. explain this observation.
We can see here that:
a) The expected hydroperoxide formed from the autooxidation of triphenylmethane can be represented as follows: Ph-C-O-O-H
Here, "Ph" represents the phenyl group [tex]C_{6} H_{5}-[/tex]
What is autooxidation?Autooxidation is a chemical reaction that occurs spontaneously when a substance comes into contact with atmospheric oxygen (O2) without the need for an external source of energy or a catalyst.
b) Triphenylmethane (Ph3CH) is susceptible to autooxidation due to the presence of electron-rich aromatic rings in its structure. The autooxidation process involves the transfer of oxygen atoms from atmospheric oxygen to the organic molecule, leading to the formation of reactive oxygen species.
c) The presence of phenol (C6H5OH) in the reaction mixture slows down the autooxidation of triphenylmethane. This can be attributed to the antioxidant properties of phenol. Phenol acts as a radical scavenger, meaning it can readily react with and neutralize free radicals that are formed during the autooxidation process.
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what mass of water should be added to 22.0 g of kcl to make a 5.50y mass solution? practice show your work.
To make a 5.50% mass solution of KCl, you should add 94.50 grams of water to 22.0 grams of KCl.
To determine the mass of water needed to make a 5.50% mass solution of KCl, we need to consider the following:
Mass percent = (mass of solute / mass of solution) x 100%
Given:
Mass percent = 5.50%
Mass of KCl = 22.0 g
Mass of solution = ?
Mass of water = ?
Let's assume the mass of the solution is 100 grams. Since the mass percent is given as 5.50%, we can calculate the mass of KCl in the solution:
Mass of KCl = (5.50 / 100) x 100 g = 5.50 g
The mass of water can be obtained by subtracting the mass of KCl from the total mass of the solution:
Mass of water = Mass of solution - Mass of KCl
Mass of water = 100 g - 5.50 g
Mass of water = 94.50 g
Therefore, to make a 5.50% mass solution of KCl, you should add 94.50 grams of water to 22.0 grams of KCl.
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Calculate the weight of KCLO3 that would be required to produce 29.5 L of oxygen measured at 127 degrees Celsius and 760 torr.
Oxygen:
Oxygen may refer to different things: the element itself and/or the gas molecule. The element is represented with the chemical symbol of "O." Moreover, the oxygen gas molecule is a diatomic substance represented as
.
The required weight of KCLO3 would be 83.3 grams which was obtained by multiplying the number of moles of KCLO3 with the molar mass of KCLO3 which was calculated as 122.55 g/mol.
Given volume of O2 produced (V) = 29.5 LOxygen gas is diatomic; thus, its molecular formula is O2. From this, it follows that one mole of O2 has a volume of 22.4 L when measured at standard temperature and pressure (STP). At STP, the temperature is 273.15 K and the pressure is 1 atm (or 760 torr).The volume of O2 produced can be converted to the number of moles of O2 using the relationship:PV = nRT Where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in kelvin. Solving for n: n = PV/RT
Substituting the values: n = (760 torr) x (29.5 L) / [(0.0821 L atm mol^-1 K^-1) x (127 + 273.15) K]n = 1.02 molO2 is produced from the reaction:2 KCLO3(s) → 2 KCl(s) + 3 O2(g)The balanced chemical equation shows that three moles of O2 are produced from every two moles of KCLO3 used.Therefore, the number of moles of KCLO3 required to produce 1.02 mol of O2 is:2 mol KCLO3 : 3 mol O21 mol KCLO3 : 3/2 mol O21.02 mol O2 x (1 mol KCLO3 / (3/2 mol O2)) = 0.68 mol KCLO3The molar mass of KCLO3 is 122.55 g/mol.The weight of KCLO3 required to produce 29.5 L of oxygen measured at 127 degrees Celsius and 760 torr is:Weight = number of moles x molar massWeight = 0.68 mol x 122.55 g/mol = 83.3 gTherefore, the weight of KCLO3 that would be required to produce 29.5 L of oxygen measured at 127 degrees Celsius and 760 torr is 83.3 g.Explanation:Thus, the required weight of KCLO3 would be 83.3 grams which was obtained by multiplying the number of moles of KCLO3 with the molar mass of KCLO3 which was calculated as 122.55 g/mol.
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Which action would shift this reaction away from solid calcium fluoride and toward the dissolved ions?
A. adding calcium ions
B. adding fluoride ions
C. removing fluoride ions
D. removing calcium fluoride
Removing fluoride ions would shift this reaction away from solid calcium fluoride and toward the dissolved ions.
What is chemical reaction?A chemical reaction embodies a transformative process wherein atoms undergo reconfiguration to yield novel compounds. During this reaction, the constituent atoms of the reactants undergo rearrangement, ultimately giving rise to distinct products.
These products possess properties that diverge from those of the initial reactants. It is important to discern chemical reactions from physical changes, which pertain to alterations in the state of matter, such as the transition of ice to liquid water or the conversion of water into vapor.
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what is the absolute error (in ml) associated with a 25 ml buret
The absolute error of a 25 ml buret is 0.25 ml. The maximum absolute error can be only 0.1%
The absolute error that is connected with a measuring instrument, such as a buret, is normally given by the maker of the instrument and represents the greatest amount of variation from the actual value. It is essential to look at the specs that the manufacturer has provided for the particular buret that is under consideration.
If you do not have the specs provided by the manufacturer, it can be difficult to ascertain the exact absolute inaccuracy that is associated with a 25 ml buret. The absolute inaccuracy, on the other hand, is typically found to fall anywhere between 0.05 and 0.1 millilitres for high-quality laboratory glassware.
It is advised that the buret be frequently calibrated using the appropriate calibration standards and processes. This will ensure that the measurements that are taken are correct. Because of this, we will be better able to account for any systematic mistakes or drift in the precision of our measurements.
During the process of measuring, specific procedures must to be adhered to in order to reduce the likelihood of parallax errors and make certain that accurate results are obtained.
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consider the cell: ni(s) | ni2 (aq, ?m) || cu2 (aq, 0.136 m) | cu(s) ni2 (aq)/ni(s) e° = -0.257 v cu2 (aq)/cu(s) e° = 0.340 v the measured potential of the cell is 0.621 v. what is [ni2 ] at 25 °c?
The Nernst equation can be used to determine the concentration of a redox couple. The answer is 0.069 M.
The equation is: E = E° - (RT/nF) ln(Q)where E is the potential of the cell at any moment in time, E° is the standard potential, R is the ideal gas constant, T is temperature, n is the number of moles of electrons exchanged in the reaction, F is Faraday's constant, and Q is the reaction quotient. The reaction quotient for this half-cell is:[ni2+]/[Ni]. The Nernst equation can be rearranged to solve for [ni2+]:[ni2+] = [Ni] x e^(nE°/RT) x e^(-nFE/RT). We will solve for [ni2+] using the given data: E = 0.621 V, E° = -0.257 V, n = 2, F = 96485 C/mol, R = 8.31 J/(mol*K), and T = 298 K. First, let's find the difference between E and E°.∆E = E - E°∆E = 0.621 V - (-0.257 V)∆E = 0.878 V.
Now let's plug in the values:[ni2+] = [Ni] x e^(nE°/RT) x e^(-nFE/RT)[ni2+] = [Ni] x e^(nE°/RT) x e^(-∆E/RT)[ni2+] = [Ni] x e^(-2F∆E/RT). To solve for [ni2+], we need to determine the value of [Ni]. We can do this by using the concentration of Cu2+ and the measured potential of the cell. The overall reaction for this cell is:2Ni(s) + Cu2+(aq) -> 2Ni2+(aq) + Cu(s)The cell potential is the sum of the potential of the anode (ni(s) | ni2+(aq)) and the potential of the cathode (cu2+(aq) | cu(s)).Ecell = Eanode + Ecathode. Ecell = (-0.257 V) + (0.340 V). Ecell = 0.083 V.
Now we can use the Nernst equation to solve for [Ni]:0.083 V = E° - (RT/nF) ln(Q)[Ni]/[ni2+]^2 = e^(nFE°/RT) x e^(-E/RT)[Ni]/[ni2+]^2 = e^(2(-0.257)/0.025) x e^(-96485/8.31 x 298 x 0.083)[Ni]/[ni2+]^2 = 0.0037[Ni]/[Ni2+] = √0.0037[Ni2+] = [Ni]/√0.0037[Ni2+] = [ni2+] x √0.0037[Ni2+]. We can now substitute this expression into the previous equation:[ni2+] x √0.0037 = [Cu2+] x e^(2(-0.257)/0.025) x e^(-96485/8.31 x 298 x 0.083)[ni2+] = [Cu2+] x e^(2(0.257)/0.025) x e^(96485/8.31 x 298 x 0.083) / √0.0037[ni2+] = 0.069 M.
Thus, the answer is 0.069 M.
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Consider a 0.15M solution of ascorbic acid (vitamin C). It has a Ka1 of 8.0 x 10-5 and a Ka2 of 1.6 x 10-12. Calculate the concentrations of all the solute species. Answer using the following notation: for example, an answer of 2.0 x 10-8 is typed as 2.0E-8.
[H+] =
[HC6H6O6-] =
[C6H6O62-] =
What is the pH of the solution?
The concentrations of the solute species in the 0.15 M solution of ascorbic acid are approximately:
[H⁺] ≈ 3.464 x 10⁻³ M
[HC₆H₆O₆⁻] ≈ 0.1465 M
[C₆H₆O₆²⁻] ≈ 3.464 x 10⁻³ M
The pH of the solution is approximately 2.46.
To determine the concentrations of all solute species and the pH of the solution, we need to consider the dissociation of ascorbic acid (vitamin C) and its corresponding equilibrium reactions.
The dissociation of ascorbic acid can be represented as follows:
HC₆H₆O₆ ⇌ H⁺ + C₆H₆O₆⁻ (Equation 1)
The equilibrium constant (Kₐ₁) for this reaction is given as 8.0 x 10⁻⁵.
Since the problem states that we have a 0.15 M solution of ascorbic acid, initially, the concentration of HC₆H₆O₆ is 0.15 M. We can assume that the concentration of H⁺ and C₆H₆O₆⁻ is initially zero.
Let's define the changes in concentration for H⁺ and C₆H₆O₆⁻ as x. Then, the changes in concentration for HC₆H₆O₆ would be -x and -x, respectively.
After equilibrium is reached, we can set up an ICE (Initial, Change, Equilibrium) table:
Species | HC₆H₆O₆ | H⁺ | C₆H₆O₆⁻
Initial | 0.15 | 0 | 0
Change | -x | +x | +x
Equilibrium | 0.15-x | x | x
Using the equilibrium constant expression for Equation 1:
Kₐ₁ = [H⁺][C₆H₆O₆⁻] / [HC₆H₆O₆]
Plugging in the values from the equilibrium concentrations:
8.0 x 10⁻⁵ = x(x) / (0.15 - x)
Since Kₐ₁ is small (compared to the initial concentration of ascorbic acid), we can approximate 0.15 - x as 0.15:
8.0 x 10⁻⁵ ≈ x * x / 0.15
Rearranging the equation:
x² ≈ 8.0 x 10⁻⁵ * 0.15
x² ≈ 1.2 x 10⁻⁵
Taking the square root of both sides:
x ≈ √(1.2 x 10⁻⁵)
x ≈ 3.464 x 10⁻³
Now we can calculate the concentrations of the solute species:
[H⁺] = x ≈ 3.464 x 10⁻³ M
[HC₆H₆O₆⁻] = 0.15 - x ≈ 0.15 - 3.464 x 10⁻³ ≈ 0.1465 M
[C₆H₆O₆²⁻] = x ≈ 3.464 x 10⁻³ M
To calculate the pH of the solution, we can use the equation:
pH = -log[H⁺]
pH ≈ -log(3.464 x 10⁻³)
pH ≈ -(-2.46)
pH ≈ 2.46
The pH of the solution is approximately 2.46. This indicates that the solution is acidic since the pH is less than 7.
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The concentration of iodide ions in a saturated solution of lead(II) iodide is __________ M. The solubility product constantof PbI2 is 1.4x10-8
a. 3.8 x 10-4
b. 3.0 x 10-3
c. 1.5 x 10-3
d. 3.5 x 10-9
e. 1.4 x10-8
The concentration of iodide ions in a saturated solution of lead(II) iodide is approximately 3.5x10^-3 M. Option B
To determine the concentration of iodide ions in a saturated solution of lead(II) iodide, we need to use the solubility product constant (Ksp) of PbI2. The balanced equation for the dissolution of PbI2 is:
PbI2(s) ⇌ Pb2+(aq) + 2I-(aq)
The Ksp expression for this equation is:
Ksp = [Pb2+][I-]²
Given that the solubility product constant (Ksp) of PbI2 is 1.4x10^-8, we can assume that at equilibrium, the concentration of Pb2+ ions is equal to the concentration of iodide ions ([Pb2+] = [I-]). Let's denote the concentration of iodide ions as x.
Therefore, the Ksp expression becomes:
Ksp = x(x)² = x³
Substituting the value of Ksp into the equation:
1.4x10^-8 = x³
Taking the cube root of both sides:
x = (1.4x10^-8)^(1/3)
x ≈ 3.5x10^-3
Therefore, the concentration of iodide ions in a saturated solution of lead(II) iodide is approximately 3.5x10^-3 M. Option B
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Ammonia, NH3(g), and hydrogen chloride, HCl(g), react to form solid ammonium chloride, NH4Cl(s): NH3 (g) + HCl (g) → NH4Cl (8) Two 2.50 L flasks at 30.0°C are connected by a stopcock, as shown in the drawing
NH3(g)
HCl(g)
One flask contains 5.60gNH3(g), and the other contains 4.60 g HCl(g). When the stopcock is opened, the gases react until one is completely consumed. a) Which gas will remain in the system after the reaction is complete?
NH3NH3
HClHCl
b) What will be the final pressure of the system after the reaction is complete? (Neglect the volume of the ammonium chloride formed.
c) What mass of ammonium chloride will be formed?
The gas that will remain in the system after the reaction is complete is HCl. The final pressure of the system will be the same as the initial pressure after the reaction is complete. Approximately 6.74 g of ammonium chloride will be formed.
To determine which gas remains in the system after the reaction is complete, we need to compare the amounts of NH₃(g) and HCl(g) initially present in the flasks.
Given:
Mass of NH₃ = 5.60 g
Mass of HCl = 4.60 g
We can use the molar masses of NH₃ and HCl to convert the masses to moles:
Molar mass of NH₃ = 17.03 g/mol
Molar mass of HCl = 36.46 g/mol
Moles of NH₃ = 5.60 g / 17.03 g/mol ≈ 0.328 mol
Moles of HCl = 4.60 g / 36.46 g/mol ≈ 0.126 mol
The balanced equation for the reaction is:
NH₃(g) + HCl(g) → NH₄Cl(s)
According to the stoichiometry of the reaction, the ratio of NH₃ to HCl is 1:1. Since the moles of NH₃ and HCl are not in a 1:1 ratio, one of the reactants will be completely consumed while the other will be left over.
Since the moles of NH₃ are greater than the moles of HCl, NH₃ will be the limiting reactant, and HCl will be left over.
a) The gas that will remain in the system after the reaction is complete is HCl.
b) To determine the final pressure of the system after the reaction is complete, we need to consider the ideal gas law, which states:
PV = nRT
Since the volume (V), temperature (T), and gas constant (R) are constant, the product of pressure (P) and the number of moles (n) is constant.
Therefore, the final pressure of the system will be the same as the initial pressure, assuming no other factors (such as volume changes) affect the pressure.
c) To determine the mass of ammonium chloride formed, we need to consider the stoichiometry of the reaction. Since NH₃ and HCl react in a 1:1 ratio, the moles of NH₃ reacted will be equal to the moles of NH₄Cl formed.
Molar mass of NH₄Cl = 53.49 g/mol
Moles of NH₄Cl formed = Moles of NH₃ reacted = 0.126 mol
Mass of NH₄Cl formed = Moles of NH₄Cl formed × Molar mass of NH₄Cl
Mass of NH₄Cl formed = 0.126 mol × 53.49 g/mol ≈ 6.74 g
Therefore, approximately 6.74 g of ammonium chloride will be formed.
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1. Without conducting an experiment, how could you predict if a species in a solution is acidic or basic? Give some examples. 2. How might you explain the different strengths of acids and bases using periodic trends and molecular resonance structures? Use your data from part 1 to explain any relationships. What happens when a strong acid or strong base is added to a buffer system? Use chemical equations to support your answer.
The pH of a species in a solution can be used to predict its acidic or basic properties. Periodic trends and molecular resonance structures can be used to explain the strength of acids and bases. Data from Part 1 can be used to correlate pH values with acidity or basicity.
1. The pH of a species in a solution can be used to predict if it is acidic or basic by comparing it to the pH scale.
For example, pH values below 7 indicate acidity, while pH values above 7 indicate basicity. Additionally, knowledge of the chemical formula or structure of the species can provide insight into its acidic or basic properties.
For instance, species containing hydrogen ions (H+) or hydroxide ions (OH-) tend to be acidic or basic, respectively.
2. The strength of acids and bases can be explained using periodic trends and molecular resonance structures. Periodic trends show that the acidity of an element increases as you move across a period from left to right, while basicity increases as you move down a group.
Molecular resonance structures can reveal the stability of ions formed by acids or bases, whereas resonance structures with more stable electron configurations indicate stronger acids or bases.
The data from Part 1 can be used to analyze trends in pH values and correlate them with acidity or basicity. These reactions maintain the pH of the buffer system, showing its effectiveness in resisting pH changes. Chemical equations,
1. Buffer + Strong Acid → Weak Acid + Water
2. Buffer + Strong Base → Weak Base + Water
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A 100. 0 mL sample of natural water was titrated with NaOH. The titration required 13. 57 mL of 0. 1123 M NaOH solution to reach a light pink phenolphthalein end point. Calculate the number of millimoles of NaOH required for the titration
A 100.0 mL sample of natural water was titrated with 13.57 mL of 0.1123 M Na OH solution to reach a light pink are the phenolphthalein end point. The number of millimoles of Na OH required for the titration is 1.525011 millimoles. Titration is a technique used in chemistry
to identify the quantity of a substance by adding a reactant until the chemical reaction is completed. In titration, a solution of known concentration (the titrant) reacts with a solution of unknown concentration (the analyte) to determine its concentration. Titration of natural water with Na OH In this case, we are titrating natural water with Na OH to find the concentration of the unknown solution. The balanced chemical reaction for the titration of natural water with Na OH is:H2O + Na OH → Na+ + OH- + H2O
The volume of NaOH required to reach the end-point of the titration is 13.57 mL. The molarity of Na OH used for the titration is 0.1123 M. We can use the following formula to calculate the number of millimoles of Na OH required for the titration Millimoles of Na OH = (Volume of Na OH × Molarity of NaOH) / 1000Substitute the given values in the above equation and solve for the millimoles of Na OH required for the titration. Millimoles of Na OH = (13.57 mL × 0.1123 M) / 1000= 0.001525011 millimoles Therefore, the number of millimoles of NaOH required for the titration is 1.525011 millimoles.
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if 35.22 ml of naoh solution completely neutralizes a solution containing 0.544 g of khp, what is the molarity of the naoh solution?
The molarity of the NaOH solution is 0.0754 M. Answer: 0.0754 M.
Molarity can be defined as the number of moles of solute present in per liter of solution. To calculate the molarity of the NaOH solution, we need to use the given information. Given that 35.22 mL of NaOH solution completely neutralizes a solution containing 0.544 g of KHP.We can use the formula for molarity:
Molarity = (mass of solute / molar mass of solute) / volume of solution in L
First, we need to calculate the number of moles of KHP.Number of moles of KHP = mass of KHP / molar mass of KHP
Number of moles of KHP = 0.544 / 204.22 = 0.00266 mol
Now, we can use the balanced chemical equation for the reaction between NaOH and KHP:
NaOH + KHC8H4O4 → KNaC8H4O4 + H2O
From the equation, we can see that one mole of NaOH reacts with one mole of KHP. Therefore, the number of moles of NaOH used in the reaction is also 0.00266 mol.Since the volume of the NaOH solution used is 35.22 mL, we need to convert it into liters.Volume of NaOH solution used = 35.22 mL = 0.03522 L
Now we can calculate the molarity of the NaOH solution:
Molarity = number of moles / volume of solution
Molarity = 0.00266 / 0.03522
Molarity = 0.0754 M
Therefore, the molarity of the NaOH solution is 0.0754 M. Answer: 0.0754 M.
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identify the predominant intermolecular forces in each of the given substances.
Electrostatic (ionic) interactions : Hydrogen bonding :
van der Waals interactions :
options :
CaCl2
H2O NH4
CH4
NH3
the predominant forces in each of the following compounds are as follows: CaCl₂: ionic forces, H₂O: hydrogen bonding, NH₄: van der waals interaction, CH₄: vander waals interaction, NH₃: hydrogen bonding. these forces are based on the type of molecule or compound.
calcium chloride is an ionic compound and hence the interaction between its molecules is ionic. the bond formed between calcium chloride is formed by donation an acceptance of electron pair i.e ionic bond formation which is a strong bond.
water and NH₃ are polar molecules and also show hydrogen bonding between its molecules. oxygen forms hydrogen bond with hydrogen of another water molecule whereas nitrogen forms hydrogen bond with H of another NH₃ molecule. CH₄ and NH₄ are neutral molecules and hence have van der waals interaction.
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Describe what occurs at the molecular level when a mixture is sublimed. How does sublimation purify a substance? What materials are removed? Why do we not do melting point directly on camphor to assess its purity?
During sublimation, the thermal energy increases the kinetic energy of the particles, causing them to break intermolecular bonds and escape into the gas phase by selectively removing impurities that have different sublimation temperatures than the desired substance.
In the case of camphor, direct melting point determination is not suitable for purity assessment because camphor has a tendency to undergo decomposition rather than pure melting. Camphor can sublime at temperatures below its melting point, which means it can transition directly from a solid to a gas without melting into a liquid. This sublimation behaviour can lead to unreliable or misleading melting point measurements, making it an unsuitable method for assessing the purity of camphor. Instead, sublimation can be employed to purify camphor by selectively removing impurities that have different sublimation temperatures than camphor itself.
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a sample of gas occupies a volume of 69.5 ml . as it expands, it does 125.7 j of work on its surroundings at a constant pressure of 783 torr . what is the final volume of the gas?
The final volume of the gas is approximately 122.18 mL.
To find the final volume of the gas, we can use the formula for work done by a gas at constant pressure:
Work = Pressure(Change in Volume)
Given:
Initial Volume (V₁) = 69.5 mL
Work done (W) = 125.7 J
Pressure (P) = 783 torr
We need to convert the initial volume from milliliters (mL) to liters (L) to maintain consistent units:
V₁ = 69.5 mL = 69.5/1000 L = 0.0695 L
Now we can rearrange the formula to solve for the final volume (V₂):
W = P (V₂ - V₁)
Substituting the given values:
125.7 J = 783 torr (V₂ - 0.0695 L)
To maintain consistent units, we convert torr to atmospheres (atm):
1 atm = 760 torr
783 torr = 783/760 atm = 1.03 atm
125.7 J = 1.03 atm (V₂ - 0.0695 L)
Now we can solve for V₂:
125.7 J = 1.03 atm (V₂ - 1.03 atm * 0.0695 L)
⇒ (125.7 J + 1.03 atm) 0.0695 L = 1.03 atm * Vf
⇒ 125.7 J + 0.0713 atm L = 1.03 atm * Vf
⇒ V₂ = (125.7 J + 0.0713 atm L) / 1.03 atm
So, V₂ ≈ 122.18 mL (rounded to two decimal places)
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The atomic mass of 5626Fe is 55.934939 u, and the atomic mass of 5627Co is 55.939847 u.
1. 5627Co decays into 5626Fe
2. Beta+ (positron) decay
3. How much kinetic energy will the products of the decay have?
To calculate the kinetic energy of the products of the decay, we need to determine the energy released in the decay process.
In beta+ (positron) decay, a proton within the nucleus is converted into a neutron, and a positron and a neutrino are emitted. This process can be represented as follows:
5627Co -> 5626Fe + e+ + ν
The energy released in the decay is equal to the difference in the mass of the initial nucleus (5627Co) and the sum of the masses of the final nucleus (5626Fe), positron (e+), and neutrino (ν).
Let's calculate the energy released:
Mass of 5627Co = 55.939847 u
Mass of 5626Fe = 55.934939 u
Energy released = (Mass of 5627Co - Mass of 5626Fe) * c^2
where c is the speed of light in a vacuum, approximately 299,792,458 meters per second.
Energy released = (55.939847 u - 55.934939 u) * (299,792,458 m/s)^2
Kinetic energy = Energy released - Rest mass energy of the positron
The rest mass energy of the positron can be calculated using Einstein's mass-energy equivalence equation:
E = m * c^2
where E is the energy, m is the mass, and c is the speed of light.
Rest mass energy of the positron = (Mass of positron) * c^2
The rest mass of the positron is the same as that of an electron, which is approximately 9.10938356 × 10^-31 kilograms.
Rest mass energy of the positron = (9.10938356 × 10^-31 kg) * (299,792,458 m/s)^2
Finally, we can calculate the kinetic energy:
Kinetic energy = Energy released - Rest mass energy of the positron
Please note that the calculated values will be extremely small because positron decay involves a tiny mass difference.
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when a solid dissolves in water, heat may be evolved or absorbed. the heat of dissolution (dissolving) can be determined using a coffee cup calorimeter.
In the laboratory a general chemistry student finds that when 8.01 g of CsBr(s) are dissolved in 111.10 g of water, the temperature of the solution drops from 24.31 to 21.97 °C.
The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.64 J/°C.
Based on the student's observation, calculate the enthalpy of dissolution of CsBr(s) in kJ/mol.
Assume the specific heat of the solution is equal to the specific heat of water.
ΔHdissolution = ____ kJ/mol
By applying the principles of calorimetry and using the given data, the enthalpy of dissolution is determined to be -40.8 kJ/mol.
The enthalpy of dissolution of CsBr(s) can be calculated based on the observed temperature change and the heat capacity of the calorimeter.
The enthalpy of dissolution (ΔHdissolution) can be calculated using the equation:
ΔHdissolution = q / n
where q is the heat exchanged during the process and n is the number of moles of the substance being dissolved.
To calculate the heat exchanged, we need to determine the heat absorbed by the solution and the calorimeter. Since the specific heat of the solution is assumed to be equal to the specific heat of water, we can use the equation:
q = m × C × ΔT
where m is the mass of the water (111.10 g), C is the specific heat capacity of water, and ΔT is the temperature change (final temperature - initial temperature). The specific heat capacity of water is approximately 4.18 J/g°C.
Substituting the given values, we have:
q = (111.10 g) × (4.18 J/g°C) × (21.97°C - 24.31°C)
q = -321.26 J
Next, we need to consider the heat capacity of the calorimeter. The heat capacity (Ccal) is given as 1.64 J/°C. The negative sign indicates that the calorimeter released heat to the surroundings.
Now, we can calculate the total heat exchanged during the process (qtotal) by summing the heat absorbed by the solution and the heat released by the calorimeter:
qtotal = q(solution) + q(calorimeter)
qtotal = -321.26 J + (-1.64 J/°C) × (21.97°C - 24.31°C)
qtotal = -333.94 J
To find the number of moles of CsBr(s), we need to convert the mass of CsBr(s) to moles. The molar mass of CsBr is 212.81 g/mol.
n = mass / molar mass
n = 8.01 g / 212.81 g/mol
n = 0.0377 mol
Finally, we can calculate the enthalpy of dissolution:
ΔHdissolution = qtotal / n
ΔHdissolution = (-333.94 J) / 0.0377 mol
ΔHdissolution = -40.8 kJ/mol
Therefore, the enthalpy of dissolution of CsBr(s) is approximately -40.8 kJ/mol. The negative sign indicates that the process is exothermic, meaning heat is evolved during dissolution.
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A). What volume of butane (C4H10) is required to produce 119 liters of water according to the following reaction? (All gases are at the same temperature and pressure.)
butane (C4H10) (g) + oxygen(g) -----------> carbon dioxide (g) + water(g)
___________ liters butane (C4H10)
B). What volume of carbon dioxide is produced when 110 liters of carbon monoxide react according to the following reaction? (All gases are at the same temperature and pressure.)
carbon monoxide(g) + oxygen(g) ---------------> carbon dioxide(g)
_____________ liters carbon dioxide
A). The volume of butane required to produce 119 liters of water = 0.61539 moles × 8.314 L mol-1 K-1 × 273 K/1 atm = 133.4 liters.
B.) The volume of carbon dioxide produced when 110 liters of carbon monoxide react is 22.4 liters.
A.)The given chemical equation is: C4H10(g) + O2(g) → CO2(g) + H2O(g) From the balanced equation, it can be observed that one mole of C4H10 reacts with 13 moles of oxygen to produce 8 moles of water. Therefore, moles of water produced from 1 mole of butane = 8/1 × 1/13 = 0.61539 moles. From the ideal gas law, PV = nRT, we can rearrange it to find the volume of gas. V = nRT/P. From the equation, we know that the volume of gas is directly proportional to the number of moles of gas. So, the volume of butane required to produce 119 liters of water = 0.61539 moles × 8.314 L mol-1 K-1 × 273 K/1 atm = 133.4 liters.
B).The given chemical equation is: CO(g) + ½ O2(g) → CO2(g) From the balanced equation, it can be observed that 1 mole of CO reacts with 0.5 mole of oxygen to produce 1 mole of CO2.So, moles of CO2 produced from 1 mole of CO = 1 mole. From the ideal gas law, PV = nRT, we can rearrange it to find the volume of gas. V = nRT/P. From the equation, we know that the volume of gas is directly proportional to the number of moles of gas. So, the volume of CO2 produced when 110 liters of CO reacts = 1 mole × 8.314 L mol-1 K-1 × 273 K/1 atm = 22.4 liters. Hence, the volume of carbon dioxide produced when 110 liters of carbon monoxide react is 22.4 liters.
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