Question 1

A solution of LiCl in water has xLiCl = 0.0900.What is the molality?

Accepted Answer

A) 4.46 mol kg-1 LiCl 
B) 5.00 mol kg-1 LiCl 
C) 5.49 mol kg-1 LiCl 
D) 9.89 mol kg-1 LiCl 
A) 4.46 mol kg-1 LiCl 
B) 5.00 mol kg-1 LiCl 
C) 5.49 mol kg-1 LiCl 
D) 9.89 mol kg-1 LiCl

Question 2

Gas solubility always increases with temperature.

Accepted Answer

A) True 
 B)False

Question 3

Calculate the freezing point of a solution of 40.0 g methyl salicylate,C7H6O2,dissolved in 800.g of benzene,C6H6.   And the freezing point is 5.50 °C for benzene.

Accepted Answer

A) -2.09 °C 
B) 2.09 °C 
C) 3.41 °C 
D) 7.59 °C 
A) -2.09 °C 
B) 2.09 °C 
C) 3.41 °C 
D) 7.59 °C

Question 4

Two solutions contain the same amount of water as a solvent.One solution contains 0.5 mol glucose (C6H12O6)while the other one contains 0.2 mol of CaCl2 .If the freezing points of both solutions are the same,determine the van't Hoff i factor for CaCl2 solution.

Accepted Answer

A) 2.50 
B) 3 
C) 1.50 
D) 2.75 
E) 0.75 
A) 2.50 
B) 3 
C) 1.50 
D) 2.75 
E) 0.75

Question 5

Commercial nitric acid is 16.0 M HNO3(aq)and has a density of 1.42 g/mL.What is the mole fraction of HNO3 in this solution?

Accepted Answer

A) 0.412 
B) 0.699 
C) 0.589 
D) 0.704 
A) 0.412 
B) 0.699 
C) 0.589 
D) 0.704

Question 6

A magnesium sulfate heptahydrate solution,which is 18.00% by weight in the anhydrous compound,has a density at 20 °C of 1.20 g/mL.What is the molality of the anhydrous compound in the solution? (Atomic masses in amu: H = 1.0,O = 16.0,S = 32.1,Mg = 24.3)

Accepted Answer

A) 5.54 M 
B) 1.79 M 
C) 1.82 M 
D) 1.25 M 
E) 1.49 M 
A) 5.54 M 
B) 1.79 M 
C) 1.82 M 
D) 1.25 M 
E) 1.49 M

Question 7

What is the weight percent of a caffeine solution made by dissolving 8.35 g of caffeine,C8H10N4O2,in 75 g of benzene,C6H6?

Accepted Answer

A) 0.010% 
B) 0.011% 
C) 10% 
D) 11% 
A) 0.010% 
B) 0.011% 
C) 10% 
D) 11%

Question 8

If a solution containing 4 mols of A and 6 mol of B boils at 85 °C and 1 atm of pressure,and the vapor pressure of pure A at 85 °C is 500 mmHg,what is the vapor pressure of pure B at this temperature?

Accepted Answer

A) 933 mmHg 
B) 336 mmHg 
C) 260 mmHg 
D) 576 mmHg 
E) 960 mmHg 
A) 933 mmHg 
B) 336 mmHg 
C) 260 mmHg 
D) 576 mmHg 
E) 960 mmHg

Question 9

Which of the following statements about ideal solutions are true?
I.Entropy effects are important for the formation of ideal solutions.
II.The heat of solution is zero.
III.The vapor pressure varies linearly with the composition.
IV.The forces between like kinds of molecules are (almost)equal to the forces between unlike kinds of molecules.

Accepted Answer

A) I,II,IV 
B) I,III,IV 
C) II,III,IV 
D) I,II,III 
E) I,II,III,IV 
A) I,II,IV 
B) I,III,IV 
C) II,III,IV 
D) I,II,III 
E) I,II,III,IV

Question 10

A sweetened cup of coffee is an example of a:

Accepted Answer

A) heterogeneous mixture 
B) homogeneous mixture 
C) solid solution 
D) pure liquid 
E) gaseous solute in a liquid solvent 
A) heterogeneous mixture 
B) homogeneous mixture 
C) solid solution 
D) pure liquid 
E) gaseous solute in a liquid solvent

Question 11

For the formation of an ideal solution from two liquid hydrocarbons,ΔHsoln < 0.

Accepted Answer

A) True 
 B)False

Question 12

The concentration unit used in Raoult's Law calculations is ________.

Accepted Answer

A) mole fraction 
B) percent by weight 
C) molarity 
D) molality 
E) grams per L 
A) mole fraction 
B) percent by weight 
C) molarity 
D) molality 
E) grams per L

Question 13

At 20 °C,a 0.376 mol L-1 aqueous solution of ammonium chloride has a density of   What is the mass % of ammonium chloride in the solution? 
The formula weight of   Cl is

Accepted Answer

A) 0.381 
B) 0.705 
C) 0.374 
D) 2.68 
E) 2.00 
A) 0.381 
B) 0.705 
C) 0.374 
D) 2.68 
E) 2.00

Question 14

Which of the following is a true solution with particles less than 1 nm in size?

Accepted Answer

A) calcium chloride in water 
B) oil in water 
C) whipped cream 
D) milk 
A) calcium chloride in water 
B) oil in water 
C) whipped cream 
D) milk

Question 15

What volume of an aqueous solution of 0.716 mol L-1 KBr is needed to provide 30.5 g of KBr?

Accepted Answer

A) 21.8 mL 
B) 42.7 mL 
C) 184 mL 
D) 357 mL 
A) 21.8 mL 
B) 42.7 mL 
C) 184 mL 
D) 357 mL

Question 16

The solubility of CO in water at 0 °C and 1 atm CO pressure is 0.0354 mg of CO in 1 mL of water.Calculate the molarity of aqueous CO solution at the normal partial pressure of CO of 0.00036 atm?

Accepted Answer

A) 4.5 × 10-7 M 
B) 1.6 × 10-3 M 
C) 1.3 × 10-5 M 
D) 2.9 × 10-4 M 
E) 3.2 × 10-3 M 
A) 4.5 × 10-7 M 
B) 1.6 × 10-3 M 
C) 1.3 × 10-5 M 
D) 2.9 × 10-4 M 
E) 3.2 × 10-3 M

Question 17

In the solution,a solute is present in the greatest quantity.

Accepted Answer

A) True 
 B)False

Question 18

Which compound is likely to be the most soluble in water?

Accepted Answer

A) butyl alcohol (CH3CH2CH2CH2OH) 
B) ethylene glycol (HOCH2CH2OH) 
C) hexane (C6H14) 
D) benzene (C6H12) 
E) iodine (I2) 
A) butyl alcohol (CH3CH2CH2CH2OH) 
B) ethylene glycol (HOCH2CH2OH) 
C) hexane (C6H14) 
D) benzene (C6H12) 
E) iodine (I2)

Question 19

An azeotropic mixture is a:

Accepted Answer

A) mixture of two or more substances where boiling point cannot be determined 
B) solution of two or more substances present in the same amounts in the liquid phase 
C) liquid mixture of two or more substances in which the vapor has the same composition as the liquid 
D) liquid mixture of two or more substances linked by azide functional groups 
E) solution of two or more substances that cannot be made to freeze 
A) mixture of two or more substances where boiling point cannot be determined 
B) solution of two or more substances present in the same amounts in the liquid phase 
C) liquid mixture of two or more substances in which the vapor has the same composition as the liquid 
D) liquid mixture of two or more substances linked by azide functional groups 
E) solution of two or more substances that cannot be made to freeze

Question 20

A solution of LiCl in water is 20.0 wt% LiCl.What is the mole fraction of LiCl? Assume the density of the solution is 1.00 g mL-1.

Accepted Answer

A) 0.0960 
B) 0.106 
C) 0.472 
D) 4.44 
A) 0.0960 
B) 0.106 
C) 0.472 
D) 4.44

Exam 14: Solutions and Their Physical Properties

A solution of LiCl in water has xLiCl = 0.0900.What is the molality?

Gas solubility always increases with temperature.

Calculate the freezing point of a solution of 40.0 g methyl salicylate,C7H6O2,dissolved in 800.g of benzene,C6H6. And the freezing point is 5.50 °C for benzene.

Two solutions contain the same amount of water as a solvent.One solution contains 0.5 mol glucose (C6H12O6)while the other one contains 0.2 mol of CaCl2 .If the freezing points of both solutions are the same,determine the van't Hoff i factor for CaCl2 solution.

Commercial nitric acid is 16.0 M HNO3(aq)and has a density of 1.42 g/mL.What is the mole fraction of HNO3 in this solution?

A magnesium sulfate heptahydrate solution,which is 18.00% by weight in the anhydrous compound,has a density at 20 °C of 1.20 g/mL.What is the molality of the anhydrous compound in the solution? (Atomic masses in amu: H = 1.0,O = 16.0,S = 32.1,Mg = 24.3)

What is the weight percent of a caffeine solution made by dissolving 8.35 g of caffeine,C8H10N4O2,in 75 g of benzene,C6H6?

If a solution containing 4 mols of A and 6 mol of B boils at 85 °C and 1 atm of pressure,and the vapor pressure of pure A at 85 °C is 500 mmHg,what is the vapor pressure of pure B at this temperature?

A sweetened cup of coffee is an example of a:

For the formation of an ideal solution from two liquid hydrocarbons,ΔHsoln < 0.

The concentration unit used in Raoult's Law calculations is ________.

At 20 °C,a 0.376 mol L-1 aqueous solution of ammonium chloride has a density of What is the mass % of ammonium chloride in the solution? The formula weight of Cl is

Which of the following is a true solution with particles less than 1 nm in size?

What volume of an aqueous solution of 0.716 mol L-1 KBr is needed to provide 30.5 g of KBr?

The solubility of CO in water at 0 °C and 1 atm CO pressure is 0.0354 mg of CO in 1 mL of water.Calculate the molarity of aqueous CO solution at the normal partial pressure of CO of 0.00036 atm?

In the solution,a solute is present in the greatest quantity.

Which compound is likely to be the most soluble in water?

An azeotropic mixture is a:

A solution of LiCl in water is 20.0 wt% LiCl.What is the mole fraction of LiCl? Assume the density of the solution is 1.00 g mL-1.

Matter: Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Valence Bond and Molecular Orbital Theories

Intermolecular Forces: Liquids and Solids

Spontaneous Change: Entropy and Gibbs Energy

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acidbase Equilibria

Solubility and Complex-Ion Equilibria

Electrochemistry

Chemical Kinetics

Chemistry of the Main-Group Elements I: Groups 1,2,13,and 14

Chemistry of the Main-Group Elements Ii: Groups 18,17,16,15,and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

A solution of LiCl in water has x_LiCl = 0.0900.What is the molality?

Calculate the freezing point of a solution of 40.0 g methyl salicylate,C₇H₆O₂,dissolved in 800.g of benzene,C₆H₆. And the freezing point is 5.50 °C for benzene.

Two solutions contain the same amount of water as a solvent.One solution contains 0.5 mol glucose (C₆H₁₂O₆)while the other one contains 0.2 mol of CaCl₂ .If the freezing points of both solutions are the same,determine the van't Hoff i factor for CaCl₂ solution.

Commercial nitric acid is 16.0 M HNO₃(aq)and has a density of 1.42 g/mL.What is the mole fraction of HNO₃ in this solution?

What is the weight percent of a caffeine solution made by dissolving 8.35 g of caffeine,C₈H₁₀N₄O₂,in 75 g of benzene,C₆H₆?

For the formation of an ideal solution from two liquid hydrocarbons,ΔH_soln < 0.

At 20 °C,a 0.376 mol L^-1 aqueous solution of ammonium chloride has a density of What is the mass % of ammonium chloride in the solution? The formula weight of Cl is

What volume of an aqueous solution of 0.716 mol L^-1 KBr is needed to provide 30.5 g of KBr?

A solution of LiCl in water is 20.0 wt% LiCl.What is the mole fraction of LiCl? Assume the density of the solution is 1.00 g mL^-1.