the answer is NOT 0.375 or 0.542 In solutions composed of two liquids (A and B),

Question

the answer is NOT 0.375 or 0.542

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 P and PB are the vapor pressures of pure A and B, respectively Part B 229.5 torr). What is the total vapor pressure Pota A solution is composed of 1.50 mol cyclohexane (Py-97.6 torr) and 2.50 mol acetone (Pc above this solution? Express your answer with the appropriate units Hints Potal= 180 torr Submit My Answers Give Up 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 As you saw in Part B, the vapor above the cyclohexane-acetone solution is composed of both cyclohexane vapor and acetone vapor. What mole fraction of the vapor above the solution, Xcy(vapor), is cyclohexane? Express your answer numerically Hints Xy(vapor) 0.542 Submit My Answers Give Up Incorrect; Try Again; 4 attempts remaining

Explanation / Answer

P total = 180 torr

Mol fraction of cyclohexane in vapor phase x P total = P°cy x mol fraction of cyclohexane in liquid phase

Xcy (vapor) x 180 torr = 97.6 torr x[ (moles of cyclohexane) /(moles of cyclohexane + moles of acetone)]

Xcy (vapor) x 180 = 97.6 x (1.5/1.5+2.5)

Xcy(vapor) x 180 = 97.6 x (1.5/4)

Xcy(vapor) x 180 = 97.6 x 0.375

Xcy(vapor) = 0.203

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