Question

Chemical Engineering Problem:

You have a liquid-phase mixture of 0.350 mol fraction ethanol and 0.650 mol fraction water at 760.0 mmHg. You\'d like to calculate the bubble-point temperature of the mixture, and the composition of the vapor formed at the bubble-point temperature two different ways. For the first method, assume that the solution behaves ideally and all components follow Raoult's law.

What is the bubble-point temperature of the solution?______C

What are the mole fractions of ethanol (e) and water (w) in the vapor phase at the bubble-point temperature?

For the second method, use the Txy diagram for the ethanol-water system shown below.

http://upload.wikimedia.org/wikipedia/commons/1/1e/Vapor-Liquid_Equilibrium_Mixture_of_Ethanol_and_Water.png

According to this diagram, what is the bubble-point temperature of the 0.350 mol fraction ethanol solution? (Note the requested units.)