- #1

runningman19

- 19

- 3

## Homework Statement

Hi Everyone,

I am having trouble grasping the concept of Raoult's law, partial pressures etc. One problem in specific is: A system contains 3 moles of methanol and 7 moles of water at 25 degrees celsius. The temperature is raised until there is 40 mol% methanol in the gas phase. How much is left in the liquid phase?

The Txy diagram is attached.

Thanks so much guys,

Nick

2. Homework Equations [/B]

Raoult's Law: y

_{a}P

_{a}=x

_{a}P*

_{a}

Txy diagram attached

## The Attempt at a Solution

I believe this problem requires the use of Raoult's law in some form. I have written separate Raoult's law equations for water and methanol in the solution, but neither of these equations is solvable because there are too many unknowns and too few equations.