Raoult's law

Description

Raoult’s law is a law of thermodynamics and states that the partial vapor pressure of each component of an ideal mixture of liquids is equal to the vapor pressure of the pure component multiplied by its mole fraction in the mixture. For a solution of two liquids, A and B, Raoult’s law predicts that if no other gases are present, then the total vapor pressure above the solution is equal to the weighted sum of the “pure” vapor pressures of the two components.

Related formulas

Variables

pThe total vapor pressure of the solution (Pa)
p*AThe "pure" vapor pressures of the two component A (Pa)
xAThe mole fraction of the component A (mol/mol)
p*B "pure" vapor pressures of the two component B (Pa)
xBThe mole fraction of the component B (mol/mol)