AP QUIZZES - AP TOPIC 17 Colligative Properties SET C
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QUESTION 1. If 10. g of ethanol (Molar mass = 46gmol-1) are mixed with 15 g of water, what is the mole fraction of ethanol in the mixture?

(A) 0.21
(B) 0.67
(C) 0.26
(D) 1.5
(E) 46

QUESTION 2. On mixing two liquids an exothermic heat change is observed. What can be said of the mixture?

(A) It is ideal
(B) It exhibits positive deviation
(C) It exhibits negative deviation
(D) Inter-molecular bonds have been broken
(E) None of the Above

QUESTION 3. At a certain temperature the vapor pressure of an ideal solution is 400. mmHg. The vapor pressure of the pure solvent is 812 mmHg. What is the mole fraction of the non-volatile solute?

(A) 0.493
(B) 0.507
(C) 2.03
(D) 2.97
(E) 0.970

QUESTION 4. Which of the following, when added to the same amount of water, will give the greatest lowering of freezing point?

(A) 1.5 moles of sucrose
(B) 1.5 moles of ethanoic acid
(C) 0.75 moles of Iron (III) chloride
(D) 0.75 moles of Sodium Chloride
(E) 0.50 moles of Potassium Chloride

QUESTION 5. What is the molality of a solution that contains 14.3 g of NaCl in 4.22 g of water?

(A) 5.79
(B) 57.9
(C) 0.244
(D) 0.0579
(E) None of the above



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