A solution is made by mixing 100.0 g acetone (CH3COCH3) and 100.0 g methanol (CH3OH). a. What is the vapor pressure of this solution at 25C? b. What is the composition of the vapor expressed as a mole fraction? Assume ideal solution and gas behavior. (At 25 C the vapor pressures of pure acetone and pure methanol are 271 and 143 torr, respectively.) The actual vapor pressure of this solution is 161 torr. Explain any discrepancies

Chemistry by OpenStax (2015-05-04)
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Chapter11: Solutions And Colloids
Section: Chapter Questions
Problem 65E: The vapor pressure of methanol, CH3OH, is 94 torr at 20 C. The vapor pressure of ethanol, C2H5OH, is...
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A solution is made by mixing 100.0 g acetone (CH3COCH3) and 100.0 g methanol (CH3OH).

a. What is the vapor pressure of this solution at 25C?

b. What is the composition of the vapor expressed as a mole fraction? Assume ideal solution and gas behavior. (At 25 C the vapor pressures of pure acetone and pure methanol are 271 and 143 torr, respectively.) The actual vapor pressure of this solution is 161 torr. Explain any discrepancies. 

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