solute een ed by X and defined Solutions containing volatile solutes In solution

Question

solute een ed by X and defined Solutions containing volatile solutes In solutions composed of two liquids (A and B), each liquid contributes to the total vapor pressure above the solution. The total vapor pressure is the sum of the partial pressures of the components: where PA and PB are the vapor pressures of pure A and B, respectively Part B A solution is composed of 1.70 mol cyclohexane Pa 97.6 torr) and 2.40 mol acetone Potal 229.5 torr). What is the total vapor pressure above this solution? Express your answer with the appropriate units. Potal 175 torr Submalt Hints My Answers Give up Review Part Correct If a third volatile component had been present in this solution, the total pressure would be calculated in a similar manner but would involve three terms rather than two. For example, Part C you saw in Part B, the vapor above the cyclohexane acetone solution is composed of both cyclohexane vapor

Explanation / Answer

The vlaues given before for vapor pressures:

mol of cyclohexane = 1.7

mol of ac.. = 2.4

total mol = 2.4+1.7 = 4.1

then

x-cyc = mol of cyc / total mol = 1.7/4.1 = 0.41463

mol fraction of cyclohexane = 0.41463

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