Chapter_12_and_13_Office_Hour_Packet[1]

Chapter_12_and_13_Office_Hour_Packet[1] - Extra Chapter 12...

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Extra Chapter 12 and 13 Problems 1. When a 20.0-g sample of an unknown nonelectrolyte is dissolved in 500. g of benzene, the freezing point of the resulting solution is 3.77ºC. The freezing point of pure benzene is 5.48ºC and K f for benzene is 5.12ºC/m. What is the molar mass of the unknown? A. 120. g/mol B. 140. g/mol C. 80.0 g/mol D. 100. g/mol E. 160. g/mol 2. What is the amount of dissolved CO 2 in a sealed bottle containing 0.50 L of club soda bottled at a pressure of 1.1 atm of CO 2 at 298 K. The Henry’s Law constant for CO 2 at 298 K = 6.1 x 10 -4 atm -1 , and the density of the solution is 1.0 g/mL. A. 0.0069 mol CO 2 B. 0.088 mol CO 2 C. 0.00067 mol CO 2 D. 0.0095 mol CO 2 E. 0.019 mol CO 2 3. The vapor pressure of pure water at 80 C is 355 Torr. What is the vapor pressure of a solution prepared by adding 0.300 mol of sucrose to 200 g of water at 80 C? A. 335 Torr B. 316 Torr C. 325 Torr D. 346 Torr E. 353 Torr 4. Benzene and toluene form an ideal solution. At 25 ° C, the vapor pressure of pure benzene is 95.1 Torr and the vapor pressure of pure toluene is 28.4 Torr. If a solution contains 1.0 mol of benzene and 2.0 mol of toluene, what is the mole fraction of benzene in the vapor of this solution at 25 ° C? A.

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This note was uploaded on 04/05/2008 for the course CHEM 161, 101 taught by Professor Hansell during the Spring '08 term at Rutgers.

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Chapter_12_and_13_Office_Hour_Packet[1] - Extra Chapter 12...

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