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 MF) D) and E)
G) A) and B) C

Question 2

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) 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." class="answers-bank-image d-inline" rel="preload" >
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.F) A) and E)
G) A) and C)

Question 3

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 NaClF) C) and E)
G) All of the above

Question 4

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 5

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

Accepted Answer

A) True 
 B)False

Question 6

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)  0.48F) B) and E)
G) B) and D) A

Question 7

Select the weakest electrolyte from the following set.

Accepted Answer

A)  Na2SO4
B)  KCl
C)  CH3CH2COOH,propionic acid
D)  CaCl2
E)  LiOHF) A) and D)
G) B) and D) C

Question 8

Methane has a Henry's Law constant (k) of 9.88  ×	imes×  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 F) D) and E)
G) A) and B)

Question 9

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 waterF) B) and E)
G) C) and D)

Question 10

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 11

Calculate the freezing point of a solution made by dissolving 3.50 g of potassium chloride ( f = 1.86°C/m. A) -1.7°C B) -0.9°C C) 0.0°C D) 0.9°C E) 1.7°C" class="answers-bank-image d-inline" rel="preload" >
= 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°CF) B) and E)
G) A) and E)

Question 12

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.F) B) and D)
G) C) and D)

Question 13

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 MF) A) and B)
G) A) and C)

Question 14

Select the strongest electrolyte from the following set.

Accepted Answer

A)  CH3CH2OH,ethanol
B)  LiNO3
C)  C6H12O6,glucose
D)  CCl4
E)  HFF) A) and E)
G) None of the above

Question 15

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 A) 0.0188 M B) 0.632 M C) 1.58 M D) 3.45 M E) None of these choices is correct." class="answers-bank-image d-inline" rel="preload" >
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.F) B) and C)
G) B) and E)

Question 16

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 waterF) A) and D)
G) B) and C)

Question 17

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 mF) D) and E)
G) B) and C)

Question 18

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 waterF) A) and C)
G) C) and E)

Question 19

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 20

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.F) C) and D)
G) B) and C)

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.

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedA

Select the weakest electrolyte from the following set.

Correct AnswerverifiedC

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?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

Select the strongest electrolyte from the following set.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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C

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

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

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A

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C

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?

Correct Answer
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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.

Correct Answer
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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

Correct Answer
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