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# HW9 - Chem 331 Homework#9(Ideal and Real Solutions(Due Wed...

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Chem 331, Homework #9 (Ideal and Real Solutions) (Due Wed., Nov. 14th, 2007 at beginning of class) (1) The vapor pressure of Hg is 133.3 Pa at 126.2ºC. What is its vapor pressure at this temperature when it is enclosed in a container with an air pressure of 500 bar? ρ (Hg) = 13.6 g/cm 3 . (2) Species 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 pressures of pure A and pure B. (3) At –47ºC the vapor pressure of ethyl bromide is 10.0 Torr and that of ethyl chloride is 40.0 Torr. Assume that the solution is ideal and that only a trace of liquid is present. The mole fraction of ethyl chloride in the vapor is 0.80. (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? (4) At –31.2ºC pure propane and n -butane have vapor pressures of 1200 and 200 Torr, respectively.

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