Question 1

An aqueous solution has a normal boiling point of 103.0°C.What is the freezing point of this solution? For water Kb = 0.51°C/m and Kf = 1.86°C/m.

Accepted Answer

A)  -0.82°C 
B)  - 3.0°C 
C)  -3.6°C 
D)  - 11°C 
A)  -0.82°C 
B)  - 3.0°C 
C)  -3.6°C 
D)  - 11°C

Question 2

Parts per billion requires a multiplication factor of

Accepted Answer

A)  10-9 
B)  10-3 
C)  103 
D)  106 
E)  109 
A)  10-9 
B)  10-3 
C)  103 
D)  106 
E)  109

Question 3

How much water must be added to 40.0 g of CaCl2 to produce a solution that is 35.0 wt% CaCl2?

Accepted Answer

A)  54.0 g 
B)  74.2 g 
C)  87.5 g 
D)  114 g 
A)  54.0 g 
B)  74.2 g 
C)  87.5 g 
D)  114 g

Question 4

An aqueous solution is 0.467 M in HCl.What is the molality of the solution if the density is 1.23 g/mL?

Accepted Answer

A)  0.115 m 
B)  0.268 m 
C)  0.380 m 
D)  0.574 m 
E)  0.318 m 
A)  0.115 m 
B)  0.268 m 
C)  0.380 m 
D)  0.574 m 
E)  0.318 m

Question 5

Determine the freezing point depression of a solution that contains 30.7 g glycerin (C3H8O3,molar mass = 92.09 g/mol)in 376 mL of water.Some possibly useful constants for water are Kf = 1.86°C/m and Kb = 0.512°C/m.

Accepted Answer

A)  0.887°C 
B)  1.65°C 
C)  2.18°C 
D)  3.33°C 
E)  0.654°C 
A)  0.887°C 
B)  1.65°C 
C)  2.18°C 
D)  3.33°C 
E)  0.654°C

Question 6

________ is applied to roads in wintertime so that the ice will melt at a lower temperature.

Accepted Answer

A)  Antifreeze 
B)  Water 
C)  Salt 
D)  Sugar 
E)  Oil 
A)  Antifreeze 
B)  Water 
C)  Salt 
D)  Sugar 
E)  Oil

Question 7

Why isn't pentanol (CH3CH2CH2CH2CH2OH)very soluble in water?

Accepted Answer

Even though the pentanol molecule contai

Question 8

A solution is 2.25% by weight NaHCO3.How many grams of NaHCO3 are in 150.0 g of solution?

Accepted Answer

A)  1.50 g 
B)  3.38 g 
C)  66.7 g 
D)  225 g 
A)  1.50 g 
B)  3.38 g 
C)  66.7 g 
D)  225 g

Question 9

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

Accepted Answer

A)  106 mm Hg 
B)  121 mm Hg 
C)  131 mm Hg 
D)  242 mm Hg 
A)  106 mm Hg 
B)  121 mm Hg 
C)  131 mm Hg 
D)  242 mm Hg

Question 10

How many moles of KF are contained in 244 mL of 0.135 m KF solution? The density of the solution is 1.22 g/mL.

Accepted Answer

A)  4.31 × 10-2 mol KF 
B)  4.02 × 10-2 mol KF 
C)  3.29 × 10-2 mol KF 
D)  2.32 × 10-2 mol KF 
E)  1.67 × 10-2 mol KF 
A)  4.31 × 10-2 mol KF 
B)  4.02 × 10-2 mol KF 
C)  3.29 × 10-2 mol KF 
D)  2.32 × 10-2 mol KF 
E)  1.67 × 10-2 mol KF

Question 11

What happens to a supersaturated solution of potassium acetate once it is cooled and a small crystal of solid potassium acetate is added?

Accepted Answer

The portion of potassium aceta

Question 12

What molality of pentane is obtained by dissolving 15 g pentane,C5H12,in 245.0 g hexane,C6H14?

Accepted Answer

A)  0.058 m 
B)  0.068 m 
C)  0.85 m 
D)  61 m 
A)  0.058 m 
B)  0.068 m 
C)  0.85 m 
D)  61 m

Question 13

What is the osmotic pressure of a solution containing 541 mg of aspartame (C14H18N2O5)in a total volume of 60.0 mL of water at 25°C?

Accepted Answer

A)  0.749 atm 
B)  1.14 atm 
C)  2.35 atm 
D)  0.0624 atm 
A)  0.749 atm 
B)  1.14 atm 
C)  2.35 atm 
D)  0.0624 atm

Question 14

Fluids used for an intravenous transfusion must be ________ with bodily fluids.

Accepted Answer

A)  isosmotic 
B)  hyperosmotic 
C)  hyposmotic 
D)  neosmotic 
E)  magnosmotic 
A)  isosmotic 
B)  hyperosmotic 
C)  hyposmotic 
D)  neosmotic 
E)  magnosmotic

Question 15

At 20°C,an aqueous solution that is 24.0% by mass in ammonium chloride has a density of   What is the molarity of ammonium chloride in the solution? The formula weight of NH4Cl is 53.50 g/mol.

Accepted Answer

A)  5.90 
B)  0.479 
C)  4.79 
D)  0.0445 
E)  22.5 
A)  5.90 
B)  0.479 
C)  4.79 
D)  0.0445 
E)  22.5

Question 16

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 17

A solid can be purified through what technique?

Accepted Answer

A)  recrystallization 
B)  dilution 
C)  dissolution 
D)  boiling 
E)  melting 
A)  recrystallization 
B)  dilution 
C)  dissolution 
D)  boiling 
E)  melting

Question 18

Place the following aqueous solutions of nonvolatile,nonionic compounds in order of decreasing osmotic pressure. I.0.011 M sucrose II.0.00095 M galactose III.0.0060 M glycerin

Accepted Answer

A)  I > III > II 
B)  I > II > III 
C)  II > III > I 
D)  III > I > II 
E)  II > I > III 
A)  I > III > II 
B)  I > II > III 
C)  II > III > I 
D)  III > I > II 
E)  II > I > III

Question 19

A KCl solution is prepared by dissolving 25.0 g KCl in 250.0 g of water at 25°C.What is the vapor pressure of the solution if the vapor pressure of water at 25°C is 23.76 mm Hg?

Accepted Answer

A)  21.6 mm Hg 
B)  22.7 mm Hg 
C)  23.2 mm Hg 
D)  24.9 mm Hg 
A)  21.6 mm Hg 
B)  22.7 mm Hg 
C)  23.2 mm Hg 
D)  24.9 mm Hg

Question 20

Solutions having osmotic pressures less than those of body fluids are called

Accepted Answer

A)  isosmotic. 
B)  hyperosmotic. 
C)  hyposmotic. 
D)  neosmotic. 
E)  magnosmotic. 
A)  isosmotic. 
B)  hyperosmotic. 
C)  hyposmotic. 
D)  neosmotic. 
E)  magnosmotic.

Exam 14: Solutions

An aqueous solution has a normal boiling point of 103.0°C.What is the freezing point of this solution? For water Kb = 0.51°C/m and Kf = 1.86°C/m.

Parts per billion requires a multiplication factor of

How much water must be added to 40.0 g of CaCl2 to produce a solution that is 35.0 wt% CaCl2?

An aqueous solution is 0.467 M in HCl.What is the molality of the solution if the density is 1.23 g/mL?

Determine the freezing point depression of a solution that contains 30.7 g glycerin (C3H8O3,molar mass = 92.09 g/mol)in 376 mL of water.Some possibly useful constants for water are Kf = 1.86°C/m and Kb = 0.512°C/m.

________ is applied to roads in wintertime so that the ice will melt at a lower temperature.

Why isn't pentanol (CH3CH2CH2CH2CH2OH)very soluble in water?

A solution is 2.25% by weight NaHCO3.How many grams of NaHCO3 are in 150.0 g of solution?

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

How many moles of KF are contained in 244 mL of 0.135 m KF solution? The density of the solution is 1.22 g/mL.

What happens to a supersaturated solution of potassium acetate once it is cooled and a small crystal of solid potassium acetate is added?

What molality of pentane is obtained by dissolving 15 g pentane,C5H12,in 245.0 g hexane,C6H14?

What is the osmotic pressure of a solution containing 541 mg of aspartame (C14H18N2O5)in a total volume of 60.0 mL of water at 25°C?

Fluids used for an intravenous transfusion must be ________ with bodily fluids.

At 20°C,an aqueous solution that is 24.0% by mass in ammonium chloride has a density of What is the molarity of ammonium chloride in the solution? The formula weight of NH4Cl is 53.50 g/mol.

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

A solid can be purified through what technique?

Place the following aqueous solutions of nonvolatile,nonionic compounds in order of decreasing osmotic pressure. I.0.011 M sucrose II.0.00095 M galactose III.0.0060 M glycerin

A KCl solution is prepared by dissolving 25.0 g KCl in 250.0 g of water at 25°C.What is the vapor pressure of the solution if the vapor pressure of water at 25°C is 23.76 mm Hg?

Solutions having osmotic pressures less than those of body fluids are called

Essentials: Units, Measurements, and Problem Solving

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Periodic Properties of the Elements

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Chemical Bonding I

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Crystalline Solids and Modern Materials

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An aqueous solution has a normal boiling point of 103.0°C.What is the freezing point of this solution? For water K_b = 0.51°C/m and K_f = 1.86°C/m.

How much water must be added to 40.0 g of CaCl₂ to produce a solution that is 35.0 wt% CaCl₂?

Determine the freezing point depression of a solution that contains 30.7 g glycerin (C₃H₈O₃,molar mass = 92.09 g/mol)in 376 mL of water.Some possibly useful constants for water are K_f = 1.86°C/m and K_b = 0.512°C/m.

Why isn't pentanol (CH₃CH₂CH₂CH₂CH₂OH)very soluble in water?

A solution is 2.25% by weight NaHCO₃.How many grams of NaHCO₃ are in 150.0 g of solution?

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

What molality of pentane is obtained by dissolving 15 g pentane,C₅H₁₂,in 245.0 g hexane,C₆H₁₄?

What is the osmotic pressure of a solution containing 541 mg of aspartame (C₁₄H₁₈N₂O₅)in a total volume of 60.0 mL of water at 25°C?

At 20°C,an aqueous solution that is 24.0% by mass in ammonium chloride has a density of What is the molarity of ammonium chloride in the solution? The formula weight of NH₄Cl is 53.50 g/mol.

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