AP QUIZZES - AP TOPIC 17 Colligative Properties SET B
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QUESTION 1. Calculate the Molar Mass of an ionic substance with a van't Hoff factor of 2.000, that, when 29.25 g of it is dissolved in 1.000 kg of water, the freezing point of the water drops by 1.860 oC. (The molal freezing point depression constant for water is 1.860 oC/m).

(A) 1.000
(B) 2.000
(C) 58.50
(D) 29.25
(E) 1.860

QUESTION 2. Which of the following substances has a van't Hoff factor equal to 1?

(A) NaCl
(B) KCl
(C) Ethanol
(D) MgCl2
(E) Ethanoic Acid

QUESTION 3. When salt is dissolved in water, which of the following quantities increases in value?

(A) Boiling Point and Freezing Point
(B) Freezing Point
(C) Boiling Point
(D) Vapor Pressure and Boiling Point
(E) Vapor Pressure and Freezing Point

QUESTION 4. What is the boiling point of a 4.00 m solution of KCl in water? (The molal boiling point elevation constant for water is 0.500 oC/m).

(A) 373 K
(B) 369 K
(C) 273 K
(D) 377 K
(E) None of the above

QUESTION 5. Benzene has a higher vapor pressure than Methylbenzene. Which compound has the higher boiling point?

(A) Benzene
(B) Methylbenzene
(C) They are the same
(D) It is not possible to tell from the information given
(E) None of the above




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