Question 1

How many moles of solute particles are present in 100.0 mL of 2.50 M (NH4) 3PO4?

Accepted Answer

A)  0.100 mol
B)  0.250 mol
C)  0.500 mol
D)  0.750 mol
E)  l.00 molF) C) and D)
G) A) and B)

Question 2

Safrole is used as a topical antiseptic.Calculate the vapor pressure of a solution prepared by dissolving 0.75 mol of safrole in 950 g of ethanol ( ethanol = 50.0 torr at 25°C. A) 1.8 torr B) 11 torr C) 15 torr D) 40 torr E) 48 torr" class="answers-bank-image d-inline" rel="preload" >
= 46.07 g/mol) .P°ethanol = 50.0 torr at 25°C.

Accepted Answer

A)  1.8 torr
B)  11 torr
C)  15 torr
D)  40 torr
E)  48 torrF) A) and E)
G) B) and C)

Question 3

Ideal solutions do not conform to Raoult's Law.

Accepted Answer

A) True 
 B)False

Question 4

Raoult's Law relates the vapor pressure of a solvent above a solution to the mole fraction of the solvent and the vapor pressure of the pure solvent.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following sets of conditions could exist when two liquids which are completely miscible in one another are mixed?

Accepted Answer

A)  ( Δ\DeltaΔ Hsoln > 0,entropy of system decreases) 
B)  ( Δ\DeltaΔ Hsoln  ≈\approx≈  0,entropy of system decreases) 
C)  ( Δ\DeltaΔ Hsoln  ≈\approx≈  0,entropy change of system  ≈\approx≈  0) 
D)  ( Δ\DeltaΔ Hsoln  ≈\approx≈  0,entropy of system increases) 
E)  None of these choices is correct. F) C) and D)
G) All of the above

Question 6

Two aqueous solutions are prepared: 2.0 m Cu(NO3) 2 and 2.0 m NaBr.Which of the following statements is true?

Accepted Answer

A)  The Cu(NO3) 2 solution has a higher vapor pressure and lower freezing point than the NaBr solution.
B)  The Cu(NO3) 2 solution has a higher vapor pressure and higher freezing point than the NaBr solution.
C)  The Cu(NO3) 2 solution has a lower vapor pressure and lower freezing point than the NaBr solution.
D)  The Cu(NO3) 2 solution has a lower vapor pressure and higher freezing point than the NaBr solution.
E)  None of these statements is true.F) A) and C)
G) B) and D)

Question 7

Heats of hydration may be either positive or negative.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following aqueous solutions will have the lowest osmotic pressure?

Accepted Answer

A)  0.10 m KOH
B)  0.10 m RbCl
C)  0.05 m CaSO4
D)  0.05 m BaCl2
E)  0.10 m K2SO4F) A) and C)
G) C) and D)

Question 9

Colligative properties depend on

Accepted Answer

A)  the chemical properties of the solute.
B)  the chemical properties of the solvent.
C)  the masses of the individual ions.
D)  the molar mass of the solute.
E)  the number of particles dissolved.F) B) and D)
G) None of the above

Question 10

Cinnamaldehyde ( b = 1.22°C/m,boiling point of pure ethanol = 78.5°C A) 62.4 g B) 67.8 g C) 76.2 g D) 78.5 g E) 79.6 g" class="answers-bank-image d-inline" rel="preload" >
= 132.15 g/mol) is used as a flavoring agent.What mass of cinnamaldehyde must be added to 175 g of ethanol to give a solution whose boiling point is 82.7°C?
Kb = 1.22°C/m,boiling point of pure ethanol = 78.5°C

Accepted Answer

A)  62.4 g
B)  67.8 g
C)  76.2 g
D)  78.5 g
E)  79.6 gF) A) and B)
G) A) and C)

Question 11

If the shell of a raw egg is carefully dissolved away,and the egg in its flexible membrane is then placed in distilled water,the egg's volume will expand.Explain.

Accepted Answer

The answer of If the shell of a raw egg...

Question 12

What is the molality of a solution prepared by dissolving 86.9 g of diethyl ether,C4H10O,in 425 g of benzene,C6H6?

Accepted Answer

A)  0.362 m
B)  0.498 m
C)  2.01 m
D)  2.76 m
E)  None of these choices is correct.F) All of the above
G) B) and E)

Question 13

Human blood has a molar concentration of solutes of 0.30 M.What is the osmotic pressure of blood at 25°C?

Accepted Answer

A)  0.012 atm
B)  0.62 atm
C)  6.8 atm
D)  7.3 atm
E)  >10.atmF) B) and C)
G) A) and E)

Question 14

Calcium nitrite is used as a corrosion inhibitor in lubricants.What is the molality of a solution prepared by dissolving 18.5 g of calcium nitrite in 83.5 g of distilled water?

Accepted Answer

A)  0.0342 m
B)  0.0855 m
C)  0.222 m
D)  0.444 m
E)  1.68 mF) B) and E)
G) C) and E)

Question 15

Two aqueous solutions are prepared: 1.00 m Na2CO3 and 1.00 m LiCl.Which of the following statements is true?

Accepted Answer

A)  The Na2CO3 solution has a higher osmotic pressure and higher vapor pressure than the LiCl solution.
B)  The Na2CO3 solution has a higher osmotic pressure and higher boiling point than the LiCl solution.
C)  The Na2CO3 solution has a lower osmotic pressure and lower vapor pressure than the LiCI solution.
D)  The Na2CO3 solution has a lower osmotic pressure and higher boiling point than the LiCl solution.
E)  None of these statements is true.F) A) and C)
G) C) and D)

Question 16

Dimethylglyoxime,DMG,is an organic compound used to test for aqueous nickel(II) ions.A solution prepared by dissolving 65.0 g of DMG in 375 g of ethanol boils at 80.3°C.What is the molar mass of DMG?
Kb = 1.22°C/m,boiling point of pure ethanol = 78.5°C

Accepted Answer

A)  44.1 g/mol
B)  65.8 g/mol
C)  117 g/mol
D)  131.6 g/mol
E)  553 g/molF) B) and D)
G) D) and E)

Question 17

Calculate the molarity of a solution prepared by diluting 1.85 L of 6.5 M KOH to 11.0 L.

Accepted Answer

A)  0.28 M
B)  0.91 M
C)  1.1 M
D)  3.1 M
E)  3.9 MF) A) and D)
G) C) and E)

Question 18

If the density of a solution is less than 1.0 g/mL,its molarity will be greater than its molality.

Accepted Answer

A) True 
 B)False

Question 19

Potassium fluoride is used for frosting glass.Calculate the molarity of a solution prepared by dissolving 78.6 g of KF in enough water to produce 225 mL of solution.

Accepted Answer

A)  0.304 M
B)  0.349 M
C)  1.35 M
D)  3.29 M
E)  6.01 MF) A) and B)
G) A) and C)

Question 20

A 7.112 M solution of sulfuric acid (H2SO4)in water has a density of 1.395 g/mL.What is its molality?

Accepted Answer

Exam 13: The Properties of Solutions

Which of the following sets of conditions could exist when two liquids which are completely miscible in one another are mixed?

Correct AnswerverifiedShow Answer

Colligative properties depend on

Correct AnswerverifiedShow Answer

Heats of hydration may be either positive or negative.

Correct AnswerverifiedShow Answer

Dimethylglyoxime,DMG,is an organic compound used to test for aqueous nickel(II) ions.A solution prepared by dissolving 65.0 g of DMG in 375 g of ethanol boils at 80.3°C.What is the molar mass of DMG? Kb = 1.22°C/m,boiling point of pure ethanol = 78.5°C

Correct AnswerverifiedShow Answer

Calculate the molarity of a solution prepared by diluting 1.85 L of 6.5 M KOH to 11.0 L.

Correct AnswerverifiedShow Answer

What is the molality of a solution prepared by dissolving 86.9 g of diethyl ether,C4H10O,in 425 g of benzene,C6H6?

Correct AnswerverifiedShow Answer

Raoult's Law relates the vapor pressure of a solvent above a solution to the mole fraction of the solvent and the vapor pressure of the pure solvent.

Correct AnswerverifiedShow Answer

Which of the following aqueous solutions will have the lowest osmotic pressure?

Correct AnswerverifiedShow Answer

A 7.112 M solution of sulfuric acid (H2SO4)in water has a density of 1.395 g/mL.What is its molality?

Correct AnswerverifiedShow Answer

Cinnamaldehyde ( = 132.15 g/mol) is used as a flavoring agent.What mass of cinnamaldehyde must be added to 175 g of ethanol to give a solution whose boiling point is 82.7°C? Kb = 1.22°C/m,boiling point of pure ethanol = 78.5°C

Correct AnswerverifiedShow Answer

Two aqueous solutions are prepared: 1.00 m Na2CO3 and 1.00 m LiCl.Which of the following statements is true?

Correct AnswerverifiedShow Answer

Potassium fluoride is used for frosting glass.Calculate the molarity of a solution prepared by dissolving 78.6 g of KF in enough water to produce 225 mL of solution.

Correct AnswerverifiedShow Answer

If the density of a solution is less than 1.0 g/mL,its molarity will be greater than its molality.

Correct AnswerverifiedShow Answer

Calcium nitrite is used as a corrosion inhibitor in lubricants.What is the molality of a solution prepared by dissolving 18.5 g of calcium nitrite in 83.5 g of distilled water?

Correct AnswerverifiedShow Answer

Two aqueous solutions are prepared: 2.0 m Cu(NO3) 2 and 2.0 m NaBr.Which of the following statements is true?

Correct AnswerverifiedShow Answer

Ideal solutions do not conform to Raoult's Law.

Correct AnswerverifiedShow Answer

Safrole is used as a topical antiseptic.Calculate the vapor pressure of a solution prepared by dissolving 0.75 mol of safrole in 950 g of ethanol ( = 46.07 g/mol) .P°ethanol = 50.0 torr at 25°C.

Correct AnswerverifiedShow Answer

How many moles of solute particles are present in 100.0 mL of 2.50 M (NH4) 3PO4?

Correct AnswerverifiedShow Answer

If the shell of a raw egg is carefully dissolved away,and the egg in its flexible membrane is then placed in distilled water,the egg's volume will expand.Explain.

Correct AnswerverifiedShow Answer

Human blood has a molar concentration of solutes of 0.30 M.What is the osmotic pressure of blood at 25°C?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Dimethylglyoxime,DMG,is an organic compound used to test for aqueous nickel(II) ions.A solution prepared by dissolving 65.0 g of DMG in 375 g of ethanol boils at 80.3°C.What is the molar mass of DMG? K_b = 1.22°C/m,boiling point of pure ethanol = 78.5°C

Correct Answer
verified

Correct Answer
verified

What is the molality of a solution prepared by dissolving 86.9 g of diethyl ether,C₄H₁₀O,in 425 g of benzene,C₆H₆?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A 7.112 M solution of sulfuric acid (H₂SO₄)in water has a density of 1.395 g/mL.What is its molality?

Correct Answer
verified

Cinnamaldehyde ( = 132.15 g/mol) is used as a flavoring agent.What mass of cinnamaldehyde must be added to 175 g of ethanol to give a solution whose boiling point is 82.7°C? K_b = 1.22°C/m,boiling point of pure ethanol = 78.5°C

Correct Answer
verified

Two aqueous solutions are prepared: 1.00 m Na₂CO₃ and 1.00 m LiCl.Which of the following statements is true?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Two aqueous solutions are prepared: 2.0 m Cu(NO₃) ₂ and 2.0 m NaBr.Which of the following statements is true?

Correct Answer
verified

Correct Answer
verified

Safrole is used as a topical antiseptic.Calculate the vapor pressure of a solution prepared by dissolving 0.75 mol of safrole in 950 g of ethanol ( = 46.07 g/mol) .P°_ethanol = 50.0 torr at 25°C.

Correct Answer
verified

How many moles of solute particles are present in 100.0 mL of 2.50 M (NH₄) ₃PO₄?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified