Chapter 13, Problem 152AP

The vapor pressure of ethanol $\left({\text{C}}_{\text{2}}{\text{H}}_{\text{5}}\text{OH}\right)\text{ at 20°C is 44 mmHg,}$ and the vapor pressure of methanol $\left({\text{CH}}_{\text{3}}\text{OH}\right)$ at the same temperature is 94 mmHg. A mixture of 30.0 g of methanol and 45.0 g of ethanol is prepared (and can be assumed to behave as an ideal solution). (a) Calculate the vapor pressure of methanol and ethanol above this solution at $\text{20°C}$. (b) Calculate the mole fraction of methanol and ethanol in the vapor above this solution at $\text{20°C}$. (c) Suggest a method for separating the two components of the solution.