Question 1

Which of the following concentration units are temperature dependent?

Accepted Answer

A)  mole fraction
B)  molality
C)  mass percent
D)  molarity
E)  None of the above

Question 2

A solution is prepared by dissolving 40.0 g of sucrose,C12H22O11,in 250.g of water at 25 °C.What is the vapour pressure of the solution if the vapour pressure of water at 25 °C is 23.76 mmHg?

Accepted Answer

A)  0.198 mmHg
B)  20.5 mmHg
C)  23.6 mmHg
D)  24.0 mmHg C

Question 3

Calculate the molality of a solution formed by dissolving 27.8 g of LiI in 500.0 mL of water.

Accepted Answer

A)  0.254 mol kg-1
B)  0.394 mol kg-1
C)  0.556 mol kg-1
D)  0.241 mol kg-1
E)  0.415 mol kg-1

Question 4

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

Accepted Answer

A)  0.075 mol kg-1 NaI
B)  0.075 mol kg-1 (NH4) 3PO4
C)  0.075 mol kg-1 NaBrO4
D)  0.075 mol kg-1 LiCN
E)  0.075 mol kg-1 KNO2

Question 5

Which of the following defines dynamic equilibrium of a solution?

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 condensing

Question 6

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 7

Calculate the freezing point of a solution of 40.0 g salicylaldehyde,C7H6O2,dissolved in 800.g of benzene,C6H6. Kf for benzene is  5.10∘Cm−1 5.10^{\circ} \mathrm{C} \mathrm{m}^{-1} 5.10∘Cm−1  and the freezing point is 5.50 °C for benzene.

Accepted Answer

A)  -2.09 °C
B)  2.09 °C
C)  3.41 °C
D)  7.59 °C

Question 8

Calculate the mass of maltose,C12H22O11,contained in 725.0 mL of solution if the measured vapour pressure of the solution is 41.6 mbar at 30 °C.The vapour pressure of pure water at 30 °C is 42.40 mbar; assume no change in volume occurs upon dissolution.

Accepted Answer

A)  482 g
B)  329 g
C)  265 g
D)  163 g
E)  94.1 g

Question 9

What is the term for the amount of solute in moles per kilogram of solvent?

Accepted Answer

A)  molality
B)  molarity
C)  mole fraction
D)  mole percent
E)  mass percent

Question 10

What volume of 3.00 mol L-1 CH3OH solution is needed to provide 0.220 mol of CH3OH?

Accepted Answer

A)  1.52 mL
B)  13.6 mL
C)  73.3 mL
D)  660 mL

Question 11

A solution of LiCl in water has XLiCl = 0.0900.What is the molality?

Accepted Answer

A)  4.46 mol kg-1 LiCl
B)  5.00 mol kg-1 LiCl
C)  5.49 mol kg-1 LiCl
D)  9.89 mol kg-1 LiCl

Question 12

A 1.00 L sample of water contains 0.0036 g of Cl- ions.Determine the concentration of chloride ions in ppm if the density of the solution is 1.00 g mL-1.

Accepted Answer

A)  2.8 ppm
B)  7.2 ppm
C)  3.6 ppm
D)  1.8 ppm
E)  5.4 ppm

Question 13

What is the mole fraction of oxygen in a gas mixture that is 37% oxygen and 63% nitrogen by volume?

Accepted Answer

A)  0.34
B)  0.37
C)  0.25
D)  0.52

Question 14

An unknown nonelectrolyte and nonvolatile compound is dissolved in enough pure water to make 229 mL of solution.The vapour pressure above the solution drops from 233.7 Torr to 229.1 Torr when 82.3 g of the compound is dissolved at constant temperature.Determine the molar mass of the unknown compound.Assume no change in volume occurs upon dissolution.

Accepted Answer

A)  323 g mol-1
B)  480 g mol-1
C)  414 g mol-1
D)  459 g mol-1
E)  508 g mol-1 A

Question 15

Calculate the osmotic pressure,in bar,of a solution containing 3.00 mg of a sugar (342 g mol-1)in 15.0 mL of water at 25 °C.

Accepted Answer

Question 16

What is the term for the amount of solute in moles per litre of solution?

Accepted Answer

A)  molality
B)  molarity
C)  mole fraction
D)  mole percent
E)  mass percent

Question 17

Define osmosis.

Accepted Answer

Osmosis is the flow of solvent...

Question 18

At 20 °C,an aqueous solution that is 24.0% by mass in ammonium chloride has a density of 1.0674  gmL−1\mathrm { g } \mathrm { mL } ^ { - 1 }gmL−1  What is the molarity of ammonium chloride in the solution? The formula weight of  NH4\mathrm { NH } _ { 4 }NH4​  Cl is  53.50 g mol−153.50 \mathrm {~g} \mathrm {~mol} ^ { - 1 }53.50 g mol−1

Accepted Answer

A)  0.209 mol L-1
B)  0.0445 mol L-1
C)  22.5 mol L-1
D)  0.479 mol L-1
E)  4.79 mol L-1

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 vapour pressure of the solution if the vapour pressure of water at 25 °C is 23.76 mmHg?

Accepted Answer

A)  21.6 mmHg
B)  22.7 mmHg
C)  23.2 mmHg
D)  24.9 mmHg B

Question 20

Choose the situation below that would result in an endothermic ?solutionH.

Accepted Answer

A) when ∣Δsolute H∣|\Delta _ { ext {solute } } H \mid∣Δsolute H∣ > ∣Δ hydration H∣|\Delta ext { hydration } H \mid∣Δ hydration H∣ B) when ∣Δsolute H∣<∣Δhydration H∣\left| \Delta _ { ext {solute } } H ight| < \left| \Delta _ { ext {hydration } } H ight|∣Δsolute H∣<∣Δhydration H∣ C) when ∣Δsolute H∣ is close to ∣Δhydration H∣\left| \Delta _ { ext {solute } } H ight| ext { is close to } \left| \Delta _ { ext {hydration } } H ight|∣Δsolute H∣ is close to ∣Δhydration H∣ D) when \left| \Delta _ { ext {solute } } H ight|">∣Δsolvent H∣>∣Δsolute H∣\left| \Delta _ { ext {solvent } } H ight| > \left| \Delta _ { ext {solute } } H ight|∣Δsolvent H∣>∣Δsolute H∣ E) There isn't enough information to determine the answer.

Exam 12: Solutions

Which of the following concentration units are temperature dependent?

Correct Answer
verified

A solution is prepared by dissolving 40.0 g of sucrose,C₁₂H₂₂O₁₁,in 250.g of water at 25 °C.What is the vapour pressure of the solution if the vapour pressure of water at 25 °C is 23.76 mmHg?

Correct Answer
verified
C

Calculate the molality of a solution formed by dissolving 27.8 g of LiI in 500.0 mL of water.

Correct Answer
verified

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

Correct Answer
verified

Which of the following defines dynamic equilibrium of a solution?

Correct Answer
verified

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

Correct Answer
verified
The portion of potassium aceta...
View Answer

Calculate the freezing point of a solution of 40.0 g salicylaldehyde,C₇H₆O₂,dissolved in 800.g of benzene,C₆H₆. K_f for benzene is $5.10^{\circ} \mathrm{C} \mathrm{m}^{-1}$ and the freezing point is 5.50 °C for benzene.

Correct Answer
verified

Calculate the mass of maltose,C₁₂H₂₂O₁₁,contained in 725.0 mL of solution if the measured vapour pressure of the solution is 41.6 mbar at 30 °C.The vapour pressure of pure water at 30 °C is 42.40 mbar; assume no change in volume occurs upon dissolution.

Correct Answer
verified

What is the term for the amount of solute in moles per kilogram of solvent?

Correct Answer
verified

What volume of 3.00 mol L^-1 CH₃OH solution is needed to provide 0.220 mol of CH₃OH?

Correct Answer
verified

A solution of LiCl in water has X_LiCl = 0.0900.What is the molality?

Correct Answer
verified

A 1.00 L sample of water contains 0.0036 g of Cl^- ions.Determine the concentration of chloride ions in ppm if the density of the solution is 1.00 g mL^-1.

Correct Answer
verified

What is the mole fraction of oxygen in a gas mixture that is 37% oxygen and 63% nitrogen by volume?

Correct Answer
verified

Correct Answer
verified
A

Calculate the osmotic pressure,in bar,of a solution containing 3.00 mg of a sugar (342 g mol^-1)in 15.0 mL of water at 25 °C.

Correct Answer
verified

What is the term for the amount of solute in moles per litre of solution?

Correct Answer
verified

Define osmosis.

Correct Answer
verified
Osmosis is the flow of solvent...
View Answer

At 20 °C,an aqueous solution that is 24.0% by mass in ammonium chloride has a density of 1.0674 $\mathrm { g } \mathrm { mL } ^ { - 1 }$ What is the molarity of ammonium chloride in the solution? The formula weight of $\mathrm { NH } _ { 4 }$ Cl is $53.50 \mathrm {~g} \mathrm {~mol} ^ { - 1 }$

Correct Answer
verified

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

Correct Answer
verified
B

Choose the situation below that would result in an endothermic ?_solutionH.

Correct Answer
verified

Exam 12: Solutions

Which of the following concentration units are temperature dependent?

Correct AnswerverifiedShow Answer

A solution is prepared by dissolving 40.0 g of sucrose,C12H22O11,in 250.g of water at 25 °C.What is the vapour pressure of the solution if the vapour pressure of water at 25 °C is 23.76 mmHg?

Correct AnswerverifiedC

Calculate the molality of a solution formed by dissolving 27.8 g of LiI in 500.0 mL of water.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following defines dynamic equilibrium of a solution?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedThe portion of potassium aceta...View AnswerShow Answer

Calculate the freezing point of a solution of 40.0 g salicylaldehyde,C7H6O2,dissolved in 800.g of benzene,C6H6. Kf for benzene is 5.10∘Cm−1 5.10^{\circ} \mathrm{C} \mathrm{m}^{-1} 5.10∘Cm−1 and the freezing point is 5.50 °C for benzene.

Correct AnswerverifiedShow Answer

Calculate the mass of maltose,C12H22O11,contained in 725.0 mL of solution if the measured vapour pressure of the solution is 41.6 mbar at 30 °C.The vapour pressure of pure water at 30 °C is 42.40 mbar; assume no change in volume occurs upon dissolution.

Correct AnswerverifiedShow Answer

What is the term for the amount of solute in moles per kilogram of solvent?

Correct AnswerverifiedShow Answer

What volume of 3.00 mol L-1 CH3OH solution is needed to provide 0.220 mol of CH3OH?

Correct AnswerverifiedShow Answer

A solution of LiCl in water has XLiCl = 0.0900.What is the molality?

Correct AnswerverifiedShow Answer

A 1.00 L sample of water contains 0.0036 g of Cl- ions.Determine the concentration of chloride ions in ppm if the density of the solution is 1.00 g mL-1.

Correct AnswerverifiedShow Answer

What is the mole fraction of oxygen in a gas mixture that is 37% oxygen and 63% nitrogen by volume?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedA

Calculate the osmotic pressure,in bar,of a solution containing 3.00 mg of a sugar (342 g mol-1)in 15.0 mL of water at 25 °C.

Correct AnswerverifiedShow Answer

What is the term for the amount of solute in moles per litre of solution?

Correct AnswerverifiedShow Answer

Define osmosis.

Correct AnswerverifiedOsmosis is the flow of solvent...View AnswerShow Answer

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedB

Choose the situation below that would result in an endothermic ?solutionH.

Correct AnswerverifiedShow Answer

Correct Answer
verified

A solution is prepared by dissolving 40.0 g of sucrose,C₁₂H₂₂O₁₁,in 250.g of water at 25 °C.What is the vapour pressure of the solution if the vapour pressure of water at 25 °C is 23.76 mmHg?

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The portion of potassium aceta...
View Answer

Calculate the freezing point of a solution of 40.0 g salicylaldehyde,C₇H₆O₂,dissolved in 800.g of benzene,C₆H₆. K_f for benzene is $5.10^{\circ} \mathrm{C} \mathrm{m}^{-1}$ and the freezing point is 5.50 °C for benzene.

Correct Answer
verified

Calculate the mass of maltose,C₁₂H₂₂O₁₁,contained in 725.0 mL of solution if the measured vapour pressure of the solution is 41.6 mbar at 30 °C.The vapour pressure of pure water at 30 °C is 42.40 mbar; assume no change in volume occurs upon dissolution.

Correct Answer
verified

Correct Answer
verified

What volume of 3.00 mol L^-1 CH₃OH solution is needed to provide 0.220 mol of CH₃OH?

Correct Answer
verified

A solution of LiCl in water has X_LiCl = 0.0900.What is the molality?

Correct Answer
verified

A 1.00 L sample of water contains 0.0036 g of Cl^- ions.Determine the concentration of chloride ions in ppm if the density of the solution is 1.00 g mL^-1.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A

Calculate the osmotic pressure,in bar,of a solution containing 3.00 mg of a sugar (342 g mol^-1)in 15.0 mL of water at 25 °C.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Osmosis is the flow of solvent...
View Answer

Correct Answer
verified

Correct Answer
verified
B

Choose the situation below that would result in an endothermic ?_solutionH.

Correct Answer
verified