# Raoult's Law

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Raoult's law is the vapor pressure of a solution is changed by the addition of a solute.

## formulas that use Raoult's Law

 $$\large{ p_s = x_s\; p°_s }$$

### Where:

$$\large{ p_s }$$ = vapor pressure of the solution

$$\large{ x_s }$$ = mole fraction of the solvent in the solution

$$\large{ p°_s }$$ = vapor pressure of the pure solvent at standard conditions