Question 1

What is the molality of a solution that is 3.68 % by mass calcium chloride?

Accepted Answer

A) 0.0332 m 
B) 0.332 m 
C) 0.344 m 
D) 0.464 m 
E) 0.506 m 
A) 0.0332 m 
B) 0.332 m 
C) 0.344 m 
D) 0.464 m 
E) 0.506 m C

Question 2

Which of the following gives the molarity of a 17.0 % by mass solution of sodium acetate, CH3COONa (molar mass = 82.0 g/mol)in water? The density of the solution is 1.09 g/mL.

Accepted Answer

A) 2.26 * 10 - 6 M 
B) 0.207 M 
C) 2.07 M 
D) 2.26 M 
E) 2.72 M 
A) 2.26 * 10 - 6 M 
B) 0.207 M 
C) 2.07 M 
D) 2.26 M 
E) 2.72 M D

Question 3

A 100.-mL sample of water is taken from the Pacific Ocean, and the water is allowed to evaporate. The salts that remain (mostly NaCl)have a mass of 3.85 g. Calculate the original concentration of NaCl, in g per liter, in the water sample.

Accepted Answer

38.5 g/L

Question 4

What is the percent CsCl by mass in a 0.711 M CsCl solution that has a density of 1.091 g/mL?

Accepted Answer

A) 3.87 * 10-4 % 
B) 3.87 * 10-1 % 
C) 11.0 % 
D) 1.10 % 
E) 6.50 * 10-2  % 
A) 3.87 * 10-4 % 
B) 3.87 * 10-1 % 
C) 11.0 % 
D) 1.10 % 
E) 6.50 * 10-2  %

Question 5

Oxygen gas makes up 21 % of the atmosphere by volume. What is the solubility of O2(g)in water at 25°C if the atmospheric pressure is 741 mmHg? The Henry's law constant for oxygen gas at 25°C is 1.3 * 10-3 mol/L·atm.

Accepted Answer

A) 2.7 * 10-4 M 
B) 1.3 * 10-3 M 
C) 6.2 * 10-3 M 
D) 9.6 * 10-3 M 
E) 0.96 M 
A) 2.7 * 10-4 M 
B) 1.3 * 10-3 M 
C) 6.2 * 10-3 M 
D) 9.6 * 10-3 M 
E) 0.96 M

Question 6

The solubility of CO2 gas in water

Accepted Answer

A) increases with increasing gas pressure. 
B) increases with decreasing gas pressure. 
C) decreases with increasing gas pressure. 
D) is not dependent on pressure. 
A) increases with increasing gas pressure. 
B) increases with decreasing gas pressure. 
C) decreases with increasing gas pressure. 
D) is not dependent on pressure.

Question 7

What is the osmotic pressure of a solution prepared from 13.7 g of the electrolyte HCl and enough water to make 0.500 L of solution at 18°C?

Accepted Answer

A) 0.55 atm 
B) 1.10 atm 
C) 8.95 atm 
D) 17.9 atm 
E) 35.9 atm 
A) 0.55 atm 
B) 1.10 atm 
C) 8.95 atm 
D) 17.9 atm 
E) 35.9 atm

Question 8

Which of the following aqueous solutions has the highest osmotic pressure at 25°C?

Accepted Answer

A) 0.2 M KBr 
B) 0.2 M ethanol 
C) 0.2 M Na2SO4 
D) 0.2 M KCl 
A) 0.2 M KBr 
B) 0.2 M ethanol 
C) 0.2 M Na2SO4 
D) 0.2 M KCl

Question 9

Which of the following aqueous solutions has the highest boiling point? Kb for water is 0.52°C/m.

Accepted Answer

A) 0.2 m KCl 
B) 0.2 m Na2SO4 
C) 0.2 m Ca(NO3)2 
D) A and B. 
E) B and C. 
A) 0.2 m KCl 
B) 0.2 m Na2SO4 
C) 0.2 m Ca(NO3)2 
D) A and B. 
E) B and C.

Question 10

A 9.50 % by mass solution of acetone (C3H6O)in water has a density of 0.9849 g/mL at 20°C. What is the molarity of this solution?

Accepted Answer

A) 0.621 M 
B) 1.61 M 
C) 1.66 M 
D) 1.71 M 
E) 16.9 M 
A) 0.621 M 
B) 1.61 M 
C) 1.66 M 
D) 1.71 M 
E) 16.9 M

Question 11

The solubility of oxygen in water is about 4.5 * 10-2 g/L. The water portion of an adult's total blood supply is about 5 liters. How many grams of oxygen could dissolve in 5 liters of water?

Accepted Answer

The answer of The solubility of oxygen in water is...

Question 12

Which one of the following would be immiscible with water?

Accepted Answer

A)   
B)   
C)   
D)   
E)   
A)   
B)   
C)   
D)   
E)

Question 13

Automobile radiators usually carry a sticker that indicates that they must contain an antifreeze solution for proper operation, winter or summer. Why should you not use ordinary water during the summer?

Accepted Answer

The antifreeze will lower the vapor pres

Question 14

The solubility of CO2 gas in water

Accepted Answer

A) increases with increasing temperature. 
B) decreases with decreasing temperature. 
C) decreases with increasing temperature. 
D) is not dependent on temperature. 
A) increases with increasing temperature. 
B) decreases with decreasing temperature. 
C) decreases with increasing temperature. 
D) is not dependent on temperature.

Question 15

What is the freezing point of a solution that contains 10.0 g of glucose (C6H12O6)in 100. g of H2O? Kf for water is 1.86°C/m.

Accepted Answer

A) -0.186°C 
B) +0.186°C 
C) -0.10°C 
D) +0.10°C 
E) -1.03°C 
A) -0.186°C 
B) +0.186°C 
C) -0.10°C 
D) +0.10°C 
E) -1.03°C

Question 16

Calculate the molality of a 20.0% by mass ammonium sulfate (NH4)2SO4 solution. The density of the solution is 1.117 g/mL.

Accepted Answer

A) 0.150 m 
B) 1.51 m 
C) 1.70 m 
D) 1.89 m 
E) 2.10 m 
A) 0.150 m 
B) 1.51 m 
C) 1.70 m 
D) 1.89 m 
E) 2.10 m

Question 17

What volume of water should be added to 600. mL of ethanol in order to have a solution that boils at 95.0°C? (For ethanol, Kb = 1.22 °C/m, density = 0.789 g/cm3, boiling point = 78.4°C)

Accepted Answer

A) 186 mL 
B) 245 mL 
C) 518 mL 
D) 116 mL 
E) 322 mL 
A) 186 mL 
B) 245 mL 
C) 518 mL 
D) 116 mL 
E) 322 mL

Question 18

The term "proof" is defined as twice the percent by volume of pure ethanol in solution. A solution that is 95% ethanol is 190 proof. What is the molarity of ethanol in a 92-proof ethanol/water solution? (Given: density of ethanol = 0.80 g/cm3; density of water = 1.0 g/cm3)

Accepted Answer

Question 19

The density of a 20.3 M CH3OH (methanol)solution is 0.858 g/mL. What is the molality of this solution? H2O is the solvent.

Accepted Answer

A) 17.4 m 
B) 20.8 m 
C) 23.7 m 
D) 70.0 m 
E) 97.6 m 
A) 17.4 m 
B) 20.8 m 
C) 23.7 m 
D) 70.0 m 
E) 97.6 m

Question 20

What is the osmotic pressure of a 0.25 M solution of sucrose at 37°C? (R = 0.0821 L.atm/K.mol)

Accepted Answer

A) 6.6 * 10-5 atm 
B) 0.76 atm 
C) 6.4 atm 
D) 100 atm 
E) 940 atm 
A) 6.6 * 10-5 atm 
B) 0.76 atm 
C) 6.4 atm 
D) 100 atm 
E) 940 atm

Exam 13: Physical Properties of Solutions

What is the molality of a solution that is 3.68 % by mass calcium chloride?

Which of the following gives the molarity of a 17.0 % by mass solution of sodium acetate, CH3COONa (molar mass = 82.0 g/mol)in water? The density of the solution is 1.09 g/mL.

A 100.-mL sample of water is taken from the Pacific Ocean, and the water is allowed to evaporate. The salts that remain (mostly NaCl)have a mass of 3.85 g. Calculate the original concentration of NaCl, in g per liter, in the water sample.

What is the percent CsCl by mass in a 0.711 M CsCl solution that has a density of 1.091 g/mL?

Oxygen gas makes up 21 % of the atmosphere by volume. What is the solubility of O2(g)in water at 25°C if the atmospheric pressure is 741 mmHg? The Henry's law constant for oxygen gas at 25°C is 1.3 * 10-3 mol/L·atm.

The solubility of CO2 gas in water

What is the osmotic pressure of a solution prepared from 13.7 g of the electrolyte HCl and enough water to make 0.500 L of solution at 18°C?

Which of the following aqueous solutions has the highest osmotic pressure at 25°C?

Which of the following aqueous solutions has the highest boiling point? Kb for water is 0.52°C/m.

A 9.50 % by mass solution of acetone (C3H6O)in water has a density of 0.9849 g/mL at 20°C. What is the molarity of this solution?

The solubility of oxygen in water is about 4.5 * 10-2 g/L. The water portion of an adult's total blood supply is about 5 liters. How many grams of oxygen could dissolve in 5 liters of water?

Which one of the following would be immiscible with water?

Automobile radiators usually carry a sticker that indicates that they must contain an antifreeze solution for proper operation, winter or summer. Why should you not use ordinary water during the summer?

The solubility of CO2 gas in water

What is the freezing point of a solution that contains 10.0 g of glucose (C6H12O6)in 100. g of H2O? Kf for water is 1.86°C/m.

Calculate the molality of a 20.0% by mass ammonium sulfate (NH4)2SO4 solution. The density of the solution is 1.117 g/mL.

What volume of water should be added to 600. mL of ethanol in order to have a solution that boils at 95.0°C? (For ethanol, Kb = 1.22 °C/m, density = 0.789 g/cm3, boiling point = 78.4°C)

The term "proof" is defined as twice the percent by volume of pure ethanol in solution. A solution that is 95% ethanol is 190 proof. What is the molarity of ethanol in a 92-proof ethanol/water solution? (Given: density of ethanol = 0.80 g/cm3; density of water = 1.0 g/cm3)

The density of a 20.3 M CH3OH (methanol)solution is 0.858 g/mL. What is the molality of this solution? H2O is the solvent.

What is the osmotic pressure of a 0.25 M solution of sucrose at 37°C? (R = 0.0821 L.atm/K.mol)

Introduction

Atoms, Molecules, and Ions

Stoichiometry

Reactions in Aqueous Solution

Gases

Energy Relationships in Chemical Reactions

The Electronic Structure of Atoms

The Periodic Table

Chemical Bonding I: the Covalent Bond

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Introduction to Organic Chemistry

Intermolecular Forces and Liquids and Solids

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Thermodynamics

Redox Reactions and Electrochemistry

The Chemistry of Coordination Compounds

Nuclear Chemistry

Organic Polymerssynthetic and Natural

Filters

Which of the following gives the molarity of a 17.0 % by mass solution of sodium acetate, CH₃COONa (molar mass = 82.0 g/mol)in water? The density of the solution is 1.09 g/mL.

Oxygen gas makes up 21 % of the atmosphere by volume. What is the solubility of O₂(g)in water at 25°C if the atmospheric pressure is 741 mmHg? The Henry's law constant for oxygen gas at 25°C is 1.3 * 10^-³ mol/L·atm.

The solubility of CO₂ gas in water

Which of the following aqueous solutions has the highest boiling point? K_b for water is 0.52°C/m.

A 9.50 % by mass solution of acetone (C₃H₆O)in water has a density of 0.9849 g/mL at 20°C. What is the molarity of this solution?

The solubility of oxygen in water is about 4.5 * 10^-2 g/L. The water portion of an adult's total blood supply is about 5 liters. How many grams of oxygen could dissolve in 5 liters of water?

The solubility of CO₂ gas in water

What is the freezing point of a solution that contains 10.0 g of glucose (C₆H₁₂O₆)in 100. g of H₂O? K_f for water is 1.86°C/m.

Calculate the molality of a 20.0% by mass ammonium sulfate (NH₄)₂SO₄ solution. The density of the solution is 1.117 g/mL.

What volume of water should be added to 600. mL of ethanol in order to have a solution that boils at 95.0°C? (For ethanol, K_b = 1.22 °C/m, density = 0.789 g/cm³, boiling point = 78.4°C)

The term "proof" is defined as twice the percent by volume of pure ethanol in solution. A solution that is 95% ethanol is 190 proof. What is the molarity of ethanol in a 92-proof ethanol/water solution? (Given: density of ethanol = 0.80 g/cm³; density of water = 1.0 g/cm³)

The density of a 20.3 M CH₃OH (methanol)solution is 0.858 g/mL. What is the molality of this solution? H₂O is the solvent.