Question 1

The mole fraction of potassium nitrate in an aqueous solution is 0.0194.The solution's density is 1.0627 g/mL.Calculate the molarity of the solution.

Accepted Answer

A) 0.0194 M 
B) 0.981 M 
C) 1.05 M 
D) 1.96 M 
E) 19.4 M 
A) 0.0194 M 
B) 0.981 M 
C) 1.05 M 
D) 1.96 M 
E) 19.4 M C

Question 2

Select the weakest electrolyte from the following set.

Accepted Answer

A) Na2SO4 
B) KCl 
C) CH3CH2COOH,propionic acid 
D) CaCl2 
E) LiOH 
A) Na2SO4 
B) KCl 
C) CH3CH2COOH,propionic acid 
D) CaCl2 
E) LiOH C

Question 3

The solubility of the oxidizing agent potassium permanganate is 7.1 g per 100.0 g of water at 25°C.What is the mole fraction of potassium permanganate in this solution?

Accepted Answer

A) 0.0080 
B) 0.0086 
C) 0.066 
D) 0.45 
E) 0.48 
A) 0.0080 
B) 0.0086 
C) 0.066 
D) 0.45 
E) 0.48 A

Question 4

From the following list of aqueous solutions and water,select the one with the lowest freezing point.

Accepted Answer

A) 0.75 M (NH4)3PO4 
B) l.0 M CaSO4 
C) l 0 M LiClO4 
D) 1.5 M CH3OH,methyl alcohol 
E) pure water 
A) 0.75 M (NH4)3PO4 
B) l.0 M CaSO4 
C) l 0 M LiClO4 
D) 1.5 M CH3OH,methyl alcohol 
E) pure water

Question 5

The density of pure water at 25°C is 0.997 g/mL.Considering water as being both solvent and solute,calculate its molarity.

Accepted Answer

The answer of The density of pure water at 25°C...

Question 6

The heat of solution is the total enthalpy change when a solution is formed from the separated solute and solvent.

Accepted Answer

A) True 
 B)False

Question 7

Methane has a Henry's Law constant (k)of 9.88 $\times$ 10-2 mol/(L·atm)when dissolved in benzene at 25°C.How many grams of CH4 will dissolve in 3.00 L of benzene if the partial pressure of CH4 is 1.48 atm?

Accepted Answer

A) 0.0667 g 
B) 0.146 g 
C) 2.34 g 
D) 4.83 g 
E) 7.02 g 
A) 0.0667 g 
B) 0.146 g 
C) 2.34 g 
D) 4.83 g 
E) 7.02 g

Question 8

Select the strongest electrolyte from the following set.

Accepted Answer

A) CH3CH2OH,ethanol 
B) LiNO3 
C) C6H12O6,glucose 
D) CCl4 
E) HF 
A) CH3CH2OH,ethanol 
B) LiNO3 
C) C6H12O6,glucose 
D) CCl4 
E) HF

Question 9

Saccharin,one of the first non-nutritive sweeteners used in soft-drinks,is 500 times sweeter than sugar in dilute aqueous solutions.The solubility of saccharin is 1.00 gram per 290 mL of solution.What is the molarity of a saturated saccharin solution?  
saccharin= 183.2 g/mol

Accepted Answer

A) 0.0188 M 
B) 0.632 M 
C) 1.58 M 
D) 3.45 M 
E) None of these choices is correct. 
A) 0.0188 M 
B) 0.632 M 
C) 1.58 M 
D) 3.45 M 
E) None of these choices is correct.

Question 10

The solubility of gases in water increases with increase in the pressure of the gas.

Accepted Answer

A) True 
 B)False

Question 11

For a given solution,which of the following concentration values will change as temperature changes?

Accepted Answer

A) mass percent 
B) molality 
C) mole fraction 
D) molarity 
E) None of these choices is correct. 
A) mass percent 
B) molality 
C) mole fraction 
D) molarity 
E) None of these choices is correct.

Question 12

The chemist,Anna Lytic,must prepare 1.00 kg of 15.0% (w/w)acetic acid using a stock solution which is 36.0% (w/w)acetic acid (d = 1.045 g/mL).Which of the following combinations will give her the solution she wants?

Accepted Answer

A) 417 mL of 36% acetic acid in 583 mL of distilled water 
B) 417 g of 36% acetic acid in 583 g of distilled water 
C) 360 mL of 36% acetic acid in 640 mL of distilled water 
D) 360 g of 36% acetic acid in 640 g of distilled water 
E) 150 g of 36% acetic acid in 850 g of distilled water 
A) 417 mL of 36% acetic acid in 583 mL of distilled water 
B) 417 g of 36% acetic acid in 583 g of distilled water 
C) 360 mL of 36% acetic acid in 640 mL of distilled water 
D) 360 g of 36% acetic acid in 640 g of distilled water 
E) 150 g of 36% acetic acid in 850 g of distilled water

Question 13

Calculate the freezing point of a solution made by dissolving 3.50 g of potassium chloride (  
= 74.55 g/mol)in 100.0 g of water.Assume ideal behavior for the solution;Kf = 1.86°C/m.

Accepted Answer

A) -1.7°C 
B) -0.9°C 
C) 0.0°C 
D) 0.9°C 
E) 1.7°C 
A) -1.7°C 
B) -0.9°C 
C) 0.0°C 
D) 0.9°C 
E) 1.7°C

Question 14

Which of the following aqueous solutions should demonstrate the most ideal behavior?

Accepted Answer

A) 0.1 M K2SO4 
B) 0.1 M CaCl2 
C) 3.0 M LiF 
D) 0.1 M MgSO4 
E) 0.1 M NaCl 
A) 0.1 M K2SO4 
B) 0.1 M CaCl2 
C) 3.0 M LiF 
D) 0.1 M MgSO4 
E) 0.1 M NaCl

Question 15

Sodium hydroxide is a common ingredient in drain cleaners such as Drano.The mole fraction of sodium hydroxide in a saturated aqueous solution is 0.310.What is the molality of the solution?

Accepted Answer

A) 0.310 m 
B) 0.690 m 
C) 1.24 m 
D) 12.4 m 
E) 25.0 m 
A) 0.310 m 
B) 0.690 m 
C) 1.24 m 
D) 12.4 m 
E) 25.0 m

Question 16

Which of the following aqueous liquids will have the lowest freezing point?

Accepted Answer

A) 0.5 m C12H22O11 (sucrose) 
B) 0.5 m Ca(NO3)2 
C) 0.5 m NiSO4 
D) 0.5 m Li3PO4 
E) pure water 
A) 0.5 m C12H22O11 (sucrose) 
B) 0.5 m Ca(NO3)2 
C) 0.5 m NiSO4 
D) 0.5 m Li3PO4 
E) pure water

Question 17

Which of the following statements describes the correct method of preparation of 1.00 L of a 2.0 M urea solution?  
urea = 60.06 g/mol

Accepted Answer

A) Dissolve 120 g of urea in 1.00 kg of distilled water. 
B) Dissolve 120 g of urea in 880 g of distilled water. 
C) Dissolve 120 g of urea in enough distilled water to produce 1.00 L of solution. 
D) Dissolve 120 g of urea in 1.00 liter of distilled water. 
E) The density of urea is needed in order to do this calculation. 
A) Dissolve 120 g of urea in 1.00 kg of distilled water. 
B) Dissolve 120 g of urea in 880 g of distilled water. 
C) Dissolve 120 g of urea in enough distilled water to produce 1.00 L of solution. 
D) Dissolve 120 g of urea in 1.00 liter of distilled water. 
E) The density of urea is needed in order to do this calculation.

Question 18

Raoult's Law relates the vapor pressure of the solvent above the solution to its mole fraction in the solution.Which of the following is an accurate statement?

Accepted Answer

A) Raoult's Law applies exactly to all solutions. 
B) Raoult's Law works best when applied to concentrated solutions. 
C) Raoult's Law works best when applied to dilute solutions. 
D) Raoult's Law applies only to non-ideal solutions. 
E) None of these statements is accurate. 
A) Raoult's Law applies exactly to all solutions. 
B) Raoult's Law works best when applied to concentrated solutions. 
C) Raoult's Law works best when applied to dilute solutions. 
D) Raoult's Law applies only to non-ideal solutions. 
E) None of these statements is accurate.

Question 19

A 50.0 % (w/w)solution of sulfuric acid (H2SO4)in water has a density of 1.395 g/mL.What is its molarity?

Accepted Answer

Question 20

A 0.89% (w/v)sodium chloride solution is referred to as physiological saline solution because it has the same concentration of salts as human blood.What is the molarity of a physiological saline solution?

Accepted Answer

A) 0.0028 M 
B) 0.015 M 
C) 0.15 M 
D) 0.30 M 
E) 0.35 M 
A) 0.0028 M 
B) 0.015 M 
C) 0.15 M 
D) 0.30 M 
E) 0.35 M

Exam 13: The Properties of Solutions

The mole fraction of potassium nitrate in an aqueous solution is 0.0194.The solution's density is 1.0627 g/mL.Calculate the molarity of the solution.

Select the weakest electrolyte from the following set.

The solubility of the oxidizing agent potassium permanganate is 7.1 g per 100.0 g of water at 25°C.What is the mole fraction of potassium permanganate in this solution?

From the following list of aqueous solutions and water,select the one with the lowest freezing point.

The density of pure water at 25°C is 0.997 g/mL.Considering water as being both solvent and solute,calculate its molarity.

The heat of solution is the total enthalpy change when a solution is formed from the separated solute and solvent.

Methane has a Henry's Law constant (k)of 9.88 ×\times× 10-2 mol/(L·atm)when dissolved in benzene at 25°C.How many grams of CH4 will dissolve in 3.00 L of benzene if the partial pressure of CH4 is 1.48 atm?

Select the strongest electrolyte from the following set.

Saccharin,one of the first non-nutritive sweeteners used in soft-drinks,is 500 times sweeter than sugar in dilute aqueous solutions.The solubility of saccharin is 1.00 gram per 290 mL of solution.What is the molarity of a saturated saccharin solution? saccharin= 183.2 g/mol

The solubility of gases in water increases with increase in the pressure of the gas.

For a given solution,which of the following concentration values will change as temperature changes?

The chemist,Anna Lytic,must prepare 1.00 kg of 15.0% (w/w)acetic acid using a stock solution which is 36.0% (w/w)acetic acid (d = 1.045 g/mL).Which of the following combinations will give her the solution she wants?

Calculate the freezing point of a solution made by dissolving 3.50 g of potassium chloride ( = 74.55 g/mol)in 100.0 g of water.Assume ideal behavior for the solution;Kf = 1.86°C/m.

Which of the following aqueous solutions should demonstrate the most ideal behavior?

Sodium hydroxide is a common ingredient in drain cleaners such as Drano.The mole fraction of sodium hydroxide in a saturated aqueous solution is 0.310.What is the molality of the solution?

Which of the following aqueous liquids will have the lowest freezing point?

Which of the following statements describes the correct method of preparation of 1.00 L of a 2.0 M urea solution? urea = 60.06 g/mol

Raoult's Law relates the vapor pressure of the solvent above the solution to its mole fraction in the solution.Which of the following is an accurate statement?

A 50.0 % (w/w)solution of sulfuric acid (H2SO4)in water has a density of 1.395 g/mL.What is its molarity?

A 0.89% (w/v)sodium chloride solution is referred to as physiological saline solution because it has the same concentration of salts as human blood.What is the molarity of a physiological saline solution?

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids,solids,and Phase Changes

The Main-Group Elements: Applying Principles of Bonding and Structure

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Methane has a Henry's Law constant (k)of 9.88 $\times$ 10^-2 mol/(L·atm)when dissolved in benzene at 25°C.How many grams of CH₄ will dissolve in 3.00 L of benzene if the partial pressure of CH₄ is 1.48 atm?

Saccharin,one of the first non-nutritive sweeteners used in soft-drinks,is 500 times sweeter than sugar in dilute aqueous solutions.The solubility of saccharin is 1.00 gram per 290 mL of solution.What is the molarity of a saturated saccharin solution? _saccharin= 183.2 g/mol

Calculate the freezing point of a solution made by dissolving 3.50 g of potassium chloride ( = 74.55 g/mol)in 100.0 g of water.Assume ideal behavior for the solution;K_f = 1.86°C/m.

Which of the following statements describes the correct method of preparation of 1.00 L of a 2.0 M urea solution? _urea = 60.06 g/mol

A 50.0 % (w/w)solution of sulfuric acid (H₂SO₄)in water has a density of 1.395 g/mL.What is its molarity?