topic11 - XI. Solutions, M, m, and Colligative Properties...

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XI. Solutions, M, m, and Colligative Properties 1. The molality of the glucose in a 1.0-molar glucose solution can be obtained by using which of the following? (A) volume of the solution (B) temperature of the solution (C) solubility of glucose in water (D) degree of dissociation of glucose (E) density of the solution Answer: E 2. At 20 o C, the vapor pressure of toluene is 22 mm Hg and that of benzene is 75 mm of Hg. An ideal solution, equimolar in toluene and benzene, is prepared. At 20 o C, what is the mole fraction of benzene in the vapor in equilibrium with this solution? (A) 0.23 (B) 0.29 (C) 0.50 (D) 0.77 (E) 0.83 Answer: D 3. A student wishes to prepare 2.0 liters of 0.10-molar KIO 3 ( molecular weight 214). The proper procedure is to weigh out: (A) 42.8 g of KIO 3 and add 2.0 kilograms of water (B) 42.8 g of KIO 3 and add water until the final homogeneous solution has a volume of 2.0 liters (C) 21.4 g of KIO 3 and add water until the final homogeneous solution has a volume of 2.0 liters (D) 42.8 g of KIO 3 and add 2.0 liters of water (E) 21.4 g of KIO 3 and add 2.0 liters of water Answer: B 4. What is the mole fraction of ethanol, C 2 H 5 OH, in an aqueous solution in which the ethanol concentration is 4.6 molal? (A) 0.0046 (B) 0.076 (C) 0.083 (D) 0.20 (E) 0.72 Answer: B 5. Which of the following aqueous solutions has the highest boiling point? (A) 0.1 M K
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This note was uploaded on 01/03/2011 for the course CHEM 1442 taught by Professor Rogers during the Spring '08 term at UT Arlington.

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topic11 - XI. Solutions, M, m, and Colligative Properties...

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