Question 1

Define the Tyndall effect.

Accepted Answer

The Tyndall effect i...

Question 2

A small amount,6.78 g,of pentane (C5H12) is mixed with 100.00 g hexane (C6H14) .Calculate the vapour pressure of the resulting solution.The vapour pressures of pure pentane and hexane are 425 Torr and 151 Torr,respectively.Assume ideal behaviour.

Accepted Answer

A)  201 Torr
B)  158 Torr
C)  183 Torr
D)  164 Torr
E)  172 TorrF) None of the above
G) B) and E)

Question 3

What is the weight percent of vitamin C in a solution made by dissolving 6.50 g of vitamin C,C6H8O6,in 55.0 g of water?

Accepted Answer

A)  0.547%
B)  1.21%
C)  10.6%
D)  11.8%E) A) and B)
F) All of the above

Question 4

Choose the aqueous solution with the lowest vapour pressure.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

Accepted Answer

A)  0.120 mol kg-1 C2H6O2
B)  0.040 mol kg-1 (NH4) 2SO4
C)  0.060 mol kg-1 K2CO3
D)  0.030 mol kg-1 LiC2H3O2
E)  They all have the same vapour pressure.F) C) and D)
G) A) and B)

Question 5

Which of the following defines dissolving?

Accepted Answer

A)  rate of dissolution = rate of deposition
B)  rate of dissolution 
C)  rate of dissolution > rate of deposition
D)  rate of bubbling > rate of dissolving
E)  rate of evaporating > rate of condensingF) A) and E)
G) All of the above

Question 6

A 125.0 mL sample of an aqueous solution at 25 °C contains 29.4 mg of an unknown nonelectrolyte compound.If the solution has an osmotic pressure of 24.4 mbar,what is the molar mass of the unknown compound?

Accepted Answer

A)  116 g mol-1
B)  281 g mol-1
C)  239 g mol-1
D)  98.6 g mol-1
E)  311 g mol-1F) A) and D)
G) A) and C)

Question 7

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

Accepted Answer

A)  21.8 mL
B)  42.7 mL
C)  184 mL
D)  357 mLE) B) and D)
F) A) and B)

Question 8

At a given temperature the vapour pressures of benzene and toluene are 183 mmHg and 59.2 mmHg,respectively.Calculate the total vapour pressure over a solution of benzene and toluene with Xbenzene = 0.580.

Accepted Answer

A)  106 mmHg
B)  121 mmHg
C)  131 mmHg
D)  242 mmHgE) A) and B)
F) None of the above

Question 9

Calculate the solution temperature required to produce an osmotic pressure of 1.18 mbar using 3.72 mg of a protein with a molar mass of 4176 g mol-1 that is dissolved in enough water to create 20.9 mL of solution.

Accepted Answer

A)  333 K
B)  298 K
C)  316 K
D)  351 K
E)  288 KF) All of the above
G) A) and E)

Question 10

Choose the aqueous solution below with the highest freezing point.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

Accepted Answer

A)  0.200 mol kg-1 Ca(ClO4) 2
B)  0.200 mol kg-1 K3PO3
C)  0.200 mol kg-1 HOCH2CH2OH
D)  0.200 mol kg-1 Ba(NO3) 2
E)  These all have the same freezing point.F) A) and E)
G) A) and D)

Question 11

What mass of CuCl2 is contained in 75.85 g of a 22.4% by mass solution of CuCl2 in water?

Accepted Answer

A)  17.0 g
B)  5.89 g
C)  29.5 g
D)  33.9 g
E)  11.2 gF) A) and B)
G) D) and E)

Question 12

Determine the freezing point of a solution that contains 78.8 g of naphthalene (C10H8,molar mass = 128.16 g mol-1) dissolved in 722 mL of benzene (d = 0.877 g mL-1) .Pure benzene has a melting point of 5.50 °C and a freezing point depression constant of 4.90 °C m-1.

Accepted Answer

A)  4.76 °C
B)  4.17 °C
C)  0.74 °C
D)  1.33 °C
E)  1.68 °CF) A) and E)
G) C) and E)

Question 13

Calculate the molality of a solution that is prepared by mixing 25.5 mL of CH3OH (d = 0.792 g mL-1) and 387 mL of CH3CH2CH2OH (d = 0.811 g mL-1) .

Accepted Answer

A)  0.630 mol kg-1
B)  0.812 mol kg-1
C)  1.57 mol kg-1
D)  2.01 mol kg-1
E)  4.98 mol kg-1F) B) and C)
G) A) and B)

Question 14

What is the expected freezing point of a 0.50 mol kg-1 solution of Li2SO4 in water? Kf for water is 1.86 °C m-1.

Accepted Answer

A)  -0.93 °C
B)  -1.9 °C
C)  -2.8 °C
D)  -6.5 °CE) A) and B)
F) A) and C)

Question 15

Which of the following ions should have the most exothermic ΔhydrationH?

Accepted Answer

A)  Na+
B)  Mg2+
C)  Al3+
D)  Ca2+
E)  Sr2+F) C) and E)
G) B) and E)

Question 16

Place the following solutions in order of increasing osmotic pressure. 
I.0.15 mol L-1 C2H6O2  \quad II.0.15 mol L-1 MgCl2  \quad III.0.15 mol L-1 NaCl

Accepted Answer

A)  III 
B)  II 
C)  I 
D)  II 
E)  I < III < II F) A) and D)
G) B) and D)

Question 17

The boiling point elevation of an aqueous sucrose solution is found to be 0.39 °C.What mass of sucrose (molar mass = 342.30 g mol-1) would be needed to dissolve in 500.0 g of water? Kb (water) = 0.512 °C m-1.

Accepted Answer

A)  261 g sucrose
B)  528 g sucrose
C)  762 g sucrose
D)  223 g sucrose
E)  130.g sucroseF) D) and E)
G) B) and D)

Question 18

Place the following aqueous solutions of nonvolatile,nonionic compounds in order of decreasing osmotic pressure. I.0.011 mol L-1 sucrose II.0.00095 mol L-1 glucose III.0.0060 mol L-1 glycerin

Accepted Answer

A)  I > III > II
B)  I > II > III
C)  II > III > I
D)  III > I > II
E)  II > I > IIIF) C) and D)
G) B) and E)

Question 19

A nonelectrolyte compound with a molar mass of 862 g mol-1 was dissolved in enough water to make 100 mL of solution at 25 °C and produced an osmotic pressure of 38.4 mbar.Calculate the mass of the compound,in mg,used to make this solution.

Accepted Answer

A)  116 mg
B)  185 mg
C)  134 mg
D)  75.3 mg
E)  84.3 mgF) B) and E)
G) A) and D)

Question 20

Identify the major force between acetone and chloroform.

Accepted Answer

A)  dipole-dipole
B)  dispersion
C)  hydrogen bonding
D)  ion-ion
E)  ion-dipoleF) A) and C)
G) A) and B)

Exam 12: Solutions

At a given temperature the vapour pressures of benzene and toluene are 183 mmHg and 59.2 mmHg,respectively.Calculate the total vapour pressure over a solution of benzene and toluene with Xbenzene = 0.580.

Correct AnswerverifiedShow Answer

Define the Tyndall effect.

Correct AnswerverifiedThe Tyndall effect i...View AnswerShow Answer

What mass of CuCl2 is contained in 75.85 g of a 22.4% by mass solution of CuCl2 in water?

Correct AnswerverifiedShow Answer

Determine the freezing point of a solution that contains 78.8 g of naphthalene (C10H8,molar mass = 128.16 g mol-1) dissolved in 722 mL of benzene (d = 0.877 g mL-1) .Pure benzene has a melting point of 5.50 °C and a freezing point depression constant of 4.90 °C m-1.

Correct AnswerverifiedShow Answer

A 125.0 mL sample of an aqueous solution at 25 °C contains 29.4 mg of an unknown nonelectrolyte compound.If the solution has an osmotic pressure of 24.4 mbar,what is the molar mass of the unknown compound?

Correct AnswerverifiedShow Answer

Choose the aqueous solution with the lowest vapour pressure.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

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What is the weight percent of vitamin C in a solution made by dissolving 6.50 g of vitamin C,C6H8O6,in 55.0 g of water?

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Which of the following ions should have the most exothermic ΔhydrationH?

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What is the expected freezing point of a 0.50 mol kg-1 solution of Li2SO4 in water? Kf for water is 1.86 °C m-1.

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A small amount,6.78 g,of pentane (C5H12) is mixed with 100.00 g hexane (C6H14) .Calculate the vapour pressure of the resulting solution.The vapour pressures of pure pentane and hexane are 425 Torr and 151 Torr,respectively.Assume ideal behaviour.

Correct AnswerverifiedShow Answer

Identify the major force between acetone and chloroform.

Correct AnswerverifiedShow Answer

A nonelectrolyte compound with a molar mass of 862 g mol-1 was dissolved in enough water to make 100 mL of solution at 25 °C and produced an osmotic pressure of 38.4 mbar.Calculate the mass of the compound,in mg,used to make this solution.

Correct AnswerverifiedShow Answer

Choose the aqueous solution below with the highest freezing point.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

Correct AnswerverifiedShow Answer

The boiling point elevation of an aqueous sucrose solution is found to be 0.39 °C.What mass of sucrose (molar mass = 342.30 g mol-1) would be needed to dissolve in 500.0 g of water? Kb (water) = 0.512 °C m-1.

Correct AnswerverifiedShow Answer

Place the following solutions in order of increasing osmotic pressure. I.0.15 mol L-1 C2H6O2 \quad II.0.15 mol L-1 MgCl2 \quad III.0.15 mol L-1 NaCl

Correct AnswerverifiedShow Answer

Calculate the molality of a solution that is prepared by mixing 25.5 mL of CH3OH (d = 0.792 g mL-1) and 387 mL of CH3CH2CH2OH (d = 0.811 g mL-1) .

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following defines dissolving?

Correct AnswerverifiedShow Answer

Calculate the solution temperature required to produce an osmotic pressure of 1.18 mbar using 3.72 mg of a protein with a molar mass of 4176 g mol-1 that is dissolved in enough water to create 20.9 mL of solution.

Correct AnswerverifiedShow Answer

Place the following aqueous solutions of nonvolatile,nonionic compounds in order of decreasing osmotic pressure. I.0.011 mol L-1 sucrose II.0.00095 mol L-1 glucose III.0.0060 mol L-1 glycerin

Correct AnswerverifiedShow Answer

At a given temperature the vapour pressures of benzene and toluene are 183 mmHg and 59.2 mmHg,respectively.Calculate the total vapour pressure over a solution of benzene and toluene with X_benzene = 0.580.

Correct Answer
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Correct Answer
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The Tyndall effect i...
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What mass of CuCl₂ is contained in 75.85 g of a 22.4% by mass solution of CuCl₂ in water?

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Determine the freezing point of a solution that contains 78.8 g of naphthalene (C₁₀H₈,molar mass = 128.16 g mol^-1) dissolved in 722 mL of benzene (d = 0.877 g mL^-1) .Pure benzene has a melting point of 5.50 °C and a freezing point depression constant of 4.90 °C m^-1.

Correct Answer
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Correct Answer
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Correct Answer
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What is the weight percent of vitamin C in a solution made by dissolving 6.50 g of vitamin C,C₆H₈O₆,in 55.0 g of water?

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Which of the following ions should have the most exothermic Δ_hydrationH?

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What is the expected freezing point of a 0.50 mol kg^-1 solution of Li₂SO₄ in water? K_f for water is 1.86 °C m^-1.

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A small amount,6.78 g,of pentane (C₅H₁₂) is mixed with 100.00 g hexane (C₆H₁₄) .Calculate the vapour pressure of the resulting solution.The vapour pressures of pure pentane and hexane are 425 Torr and 151 Torr,respectively.Assume ideal behaviour.

Correct Answer
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Correct Answer
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A nonelectrolyte compound with a molar mass of 862 g mol^-1 was dissolved in enough water to make 100 mL of solution at 25 °C and produced an osmotic pressure of 38.4 mbar.Calculate the mass of the compound,in mg,used to make this solution.

Correct Answer
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Correct Answer
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The boiling point elevation of an aqueous sucrose solution is found to be 0.39 °C.What mass of sucrose (molar mass = 342.30 g mol^-1) would be needed to dissolve in 500.0 g of water? K_b (water) = 0.512 °C m^-1.

Correct Answer
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Place the following solutions in order of increasing osmotic pressure. I.0.15 mol L^-1 C₂H₆O₂ $\quad$ II.0.15 mol L^-1 MgCl₂ $\quad$ III.0.15 mol L^-1 NaCl

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Calculate the molality of a solution that is prepared by mixing 25.5 mL of CH₃OH (d = 0.792 g mL^-1) and 387 mL of CH₃CH₂CH₂OH (d = 0.811 g mL^-1) .

Correct Answer
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What volume of a 0.716 mol L^-1 KBr solution is needed to provide 30.5 g of KBr?

Correct Answer
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Correct Answer
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Calculate the solution temperature required to produce an osmotic pressure of 1.18 mbar using 3.72 mg of a protein with a molar mass of 4176 g mol^-1 that is dissolved in enough water to create 20.9 mL of solution.

Correct Answer
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Place the following aqueous solutions of nonvolatile,nonionic compounds in order of decreasing osmotic pressure. I.0.011 mol L^-1 sucrose II.0.00095 mol L^-1 glucose III.0.0060 mol L^-1 glycerin

Correct Answer
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