Consider the following gas-aqueous liquid equilibrium for a closed system at a constant temperature. O2(g) O2(aq) What is the effect on the equilibrium composition of the liquid when the partial pressure of O2 gas above the liquid is decreased?

A) The amount of O2 dissolved in the liquid decreases. B) The amount of O2 dissolved in the liquid increases. C) The amount of O2 dissolved in the liquid does not change. D) Not enough information is provided to answer the question. E) Either A or B. A) The amount of O2 dissolved in the liquid decreases. B) The amount of O2 dissolved in the liquid increases. C) The amount of O2 dissolved in the liquid does not change. D) Not enough information is provided to answer the question. E) Either A or B. A

If the solubility of O2 at 0.160 bar and 25°C is 6.65 g/100 g H2O,what is the solubility of O2 at a pressure of 1.84 bar and 25°C?

A) 77 g/100 g H2O B) 22.5 g/100 g H2O C) 1.7 g/100 g H2O D) 0.0 g/100 g H2O E) 0.6 g/100 g H2O A) 77 g/100 g H2O B) 22.5 g/100 g H2O C) 1.7 g/100 g H2O D) 0.0 g/100 g H2O E) 0.6 g/100 g H2O A

A solution consisting of 0.276 mol of methylbenzene,C6H5CH3,in 242 g of nitrobenzene,C6H5NO2,freezes at -2.0 °C.Pure nitrobenzene freezes at 6.0°C.What is the freezing-point depression constant of nitrobenzene?

A) 7.2°C/m B) 29°C/m C) 14.0°C/m D) 3.5°C/m E) 7.0°C/m A) 7.2°C/m B) 29°C/m C) 14.0°C/m D) 3.5°C/m E) 7.0°C/m

What is the percent Na2CO3 by mass in a 1.92 molal aqueous solution?

A) 0.160% B) 16.9% C) 99.5% D) 20.4% E) 19.2% A) 0.160% B) 16.9% C) 99.5% D) 20.4% E) 19.2%

What is the vapor pressure at 20°C of an ideal solution prepared by the addition of 1.36 g of the nonvolatile solute urea,CO(NH2)2,to 24.1 g of methanol,CH3OH? The vapor pressure of pure methanol at 20°C is 89.0 mmHg.

A) 2.6708 mmHg B) 80.4 mmHg C) 84.2 mmHg D) 86.3 mmHg E) 8.51 mmHg A) 2.6708 mmHg B) 80.4 mmHg C) 84.2 mmHg D) 86.3 mmHg E) 8.51 mmHg

Exam 12: Solutions

Consider the following gas-aqueous liquid equilibrium for a closed system at a constant temperature. O₂(g) O₂(aq) What is the effect on the equilibrium composition of the liquid when the partial pressure of O₂ gas above the liquid is decreased?

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Question 1

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To determine the molar mass of a small protein in the range of 20,000-40,000 g/mol,it would be best to measure

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Question 2

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If the solubility of O₂ at 0.160 bar and 25°C is 6.65 g/100 g H₂O,what is the solubility of O₂ at a pressure of 1.84 bar and 25°C?

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Question 3

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A solution consisting of 0.276 mol of methylbenzene,C₆H₅CH₃,in 242 g of nitrobenzene,C₆H₅NO₂,freezes at -2.0 °C.Pure nitrobenzene freezes at 6.0°C.What is the freezing-point depression constant of nitrobenzene?

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Question 4

Which of the following sets of conditions favors maximum solubility of an ionic solute in water?

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Question 5

Benzene,C₆H₆,and toluene,C₆H₅CH₃,form ideal solutions.At 35°C the vapor pressure of benzene is 160.torr and that of toluene is 50.0 torr.In an experiment,3.9 mol of benzene and 5.7 mol of toluene are placed in a closed container at 35°C and allowed to come to equilibrium.What is the mole fraction of toluene in the vapor phase?

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Question 6

Which of the following sets of conditions favors maximum solubility of solute in solvent?

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Question 7

A red blood cell placed in pure water will swell because

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Question 8

When 1 mol of a nonvolatile nonelectrolyte is dissolved in 3 mol of a solvent,the vapor pressure of the solution compared with that of the pure solvent is

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Question 9

Which of the following statements best describes what happens when a small amount of solid rubidium chloride is dissolved in water?

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Question 10

What is the mole fraction of urea in a solution that contains 2.7 mol of urea and 4.6 mol of water?

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Question 11

A 3.140 molal solution of NaCl is prepared.How many grams of NaCl are present in a sample containing 2.692 kg of water?

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Question 12

What is the percent Na₂CO₃ by mass in a 1.92 molal aqueous solution?

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Question 13

Which of the following solutes in aqueous solution would be expected to exhibit the smallest freezing-point lowering (assuming ideal behavior)?

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Question 14

The molal boiling-point constant for water is 0.51°C/molal.The boiling point of a 1.00 m solution of Ca(NO₃)₂ should be increased by

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Question 15

A liquid-liquid solution is called an ideal solution if I.it obeys PV = nRT. II.it obeys Raoult's law. III.solute-solute,solvent-solvent,and solute-solvent interactions are very similar. IV.solute-solute,solvent-solvent,and solute-solvent interactions are quite different.

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Question 16

The fact that the boiling point of a pure solvent is lower than the boiling point of a solution of the same solvent is a direct consequence of the

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Question 17

What is the vapor pressure at 20°C of an ideal solution prepared by the addition of 1.36 g of the nonvolatile solute urea,CO(NH₂)₂,to 24.1 g of methanol,CH₃OH? The vapor pressure of pure methanol at 20°C is 89.0 mmHg.

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Question 18

Calculate the molecular weight of a small protein if a 0.25-g sample dissolved in 180 mL of water has an osmotic pressure of 9.2 mmHg at 25°C.(R = 0.0821 L · atm/(K · mol))

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Question 19

A concentrated hydrofluoric acid solution is 49.0% HF by mass and has a density of 1.3406 g/mL at 25°C.What is the mass of HF per L of solution?

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Question 20

Showing 1 - 20 of 119

Exam 12: Solutions

Consider the following gas-aqueous liquid equilibrium for a closed system at a constant temperature. O2(g) O2(aq) What is the effect on the equilibrium composition of the liquid when the partial pressure of O2 gas above the liquid is decreased?

To determine the molar mass of a small protein in the range of 20,000-40,000 g/mol,it would be best to measure

If the solubility of O2 at 0.160 bar and 25°C is 6.65 g/100 g H2O,what is the solubility of O2 at a pressure of 1.84 bar and 25°C?

A solution consisting of 0.276 mol of methylbenzene,C6H5CH3,in 242 g of nitrobenzene,C6H5NO2,freezes at -2.0 °C.Pure nitrobenzene freezes at 6.0°C.What is the freezing-point depression constant of nitrobenzene?

Which of the following sets of conditions favors maximum solubility of an ionic solute in water?

Which of the following sets of conditions favors maximum solubility of solute in solvent?

A red blood cell placed in pure water will swell because

When 1 mol of a nonvolatile nonelectrolyte is dissolved in 3 mol of a solvent,the vapor pressure of the solution compared with that of the pure solvent is

Which of the following statements best describes what happens when a small amount of solid rubidium chloride is dissolved in water?

What is the mole fraction of urea in a solution that contains 2.7 mol of urea and 4.6 mol of water?

A 3.140 molal solution of NaCl is prepared.How many grams of NaCl are present in a sample containing 2.692 kg of water?

What is the percent Na2CO3 by mass in a 1.92 molal aqueous solution?

Which of the following solutes in aqueous solution would be expected to exhibit the smallest freezing-point lowering (assuming ideal behavior)?

The molal boiling-point constant for water is 0.51°C/molal.The boiling point of a 1.00 m solution of Ca(NO3)2 should be increased by

A liquid-liquid solution is called an ideal solution if I.it obeys PV = nRT. II.it obeys Raoult's law. III.solute-solute,solvent-solvent,and solute-solvent interactions are very similar. IV.solute-solute,solvent-solvent,and solute-solvent interactions are quite different.

The fact that the boiling point of a pure solvent is lower than the boiling point of a solution of the same solvent is a direct consequence of the

What is the vapor pressure at 20°C of an ideal solution prepared by the addition of 1.36 g of the nonvolatile solute urea,CO(NH2)2,to 24.1 g of methanol,CH3OH? The vapor pressure of pure methanol at 20°C is 89.0 mmHg.

Calculate the molecular weight of a small protein if a 0.25-g sample dissolved in 180 mL of water has an osmotic pressure of 9.2 mmHg at 25°C.(R = 0.0821 L · atm/(K · mol))

A concentrated hydrofluoric acid solution is 49.0% HF by mass and has a density of 1.3406 g/mL at 25°C.What is the mass of HF per L of solution?

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Consider the following gas-aqueous liquid equilibrium for a closed system at a constant temperature. O₂(g) O₂(aq) What is the effect on the equilibrium composition of the liquid when the partial pressure of O₂ gas above the liquid is decreased?

If the solubility of O₂ at 0.160 bar and 25°C is 6.65 g/100 g H₂O,what is the solubility of O₂ at a pressure of 1.84 bar and 25°C?

A solution consisting of 0.276 mol of methylbenzene,C₆H₅CH₃,in 242 g of nitrobenzene,C₆H₅NO₂,freezes at -2.0 °C.Pure nitrobenzene freezes at 6.0°C.What is the freezing-point depression constant of nitrobenzene?

What is the percent Na₂CO₃ by mass in a 1.92 molal aqueous solution?

The molal boiling-point constant for water is 0.51°C/molal.The boiling point of a 1.00 m solution of Ca(NO₃)₂ should be increased by

What is the vapor pressure at 20°C of an ideal solution prepared by the addition of 1.36 g of the nonvolatile solute urea,CO(NH₂)₂,to 24.1 g of methanol,CH₃OH? The vapor pressure of pure methanol at 20°C is 89.0 mmHg.