Chem_340_Homework_Set_9_Spring_2012

Chem_340_Homework_Set_9_Spring_2012 - Torr. Assume that the...

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1 CHEM 340 Physical Chemistry for Biochemists I Spring 2012 Key to Homework Set No. 9 Due on Friday, March 30, 2012 1 . Explain why colligative properties depend only on the concentration, and not on the identity of the molecule. 2. A and B form an ideal solution. At a total pressure of 0.900 bar, y A = 0.450 and x A = 0.650. Using this information, calculate the vapor pressure of pure A and of pure B. 3. Assume that 1-bromobutane and 1-chlorobutane form an ideal solution. At 273 K, P chloro * = 3790 Pa and P bromo * = 1394 Pa. When only a trace of liquid is present at 273 K, y chloro = 0.75. a. Calculate the total pressure above the solution. b. Calculate the mole fraction of 1-chlorobutane in the solution. c. What value would Z chloro have in order for there to be 4.86 mol of liquid and 3.21 mol of gas at a total pressure equal to that in part (a)? [ Note : This composition is different from that of part (a).] 4. At –47°C, the vapor pressure of ethyl bromide is 10.0Torr and that of ethyl chloride is 40.0
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Unformatted text preview: Torr. Assume that the solution is ideal. Assume there is only a trace of liquid present and the mole fraction of ethyl chloride in the vapor is 0.80 and then answer these questions: a. What is the total pressure and the mole fraction of ethyl chloride in the liquid? b. If there are 5.00 mol of liquid and 3.00 mol of vapor present at the same pressure as in part (a), what is the overall composition of the system? 5. At 39.9C, a solution of ethanol ( x 1 = 0.9006, P 1 * = 130.4 Torr ) and isooctane ( P 2 * = 43.9 Torr ) forms a vapor phase with y 1 = 0.6667 at a total pressure of 185.9 Torr. a. Calculate the activity and activity coefficient of each component. b. Calculate the total pressure that the solution would have if it were ideal. From Atkins and DePaula Discussion: 3.6 3.8 Exercises: 3.22, 3.23, 3.30, 3.31, 3.34, 3.35, 3.36, 3.37, 3.38 Projects: 3.40 2...
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This note was uploaded on 04/07/2012 for the course CHEM 340 taught by Professor Staff during the Spring '08 term at Ill. Chicago.

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Chem_340_Homework_Set_9_Spring_2012 - Torr. Assume that the...

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