Recently Added Formulas in Chemistry

· Chemical Reactions
· Raoult's Law
· Cations and Anions
· Hess' Law
· pH and pOH

Additional Formulas

· Ideal Gas Law
· Henry's Law
· Hess' Law
· Raoult's Law
· Chemical Formulas
· Chemical Reactions
· Strength of Common Acids
· Strength of Common Bases
· Cations and Anions
· Molar Enthalpy

Current Location > Formulas in Chemistry > Chemistry (Basics) > Raoult's Law

Raoult's Law

Raoult's law is given by:

Where:
pi: pressure of component i
xi: mole fraction in the solution

: vapor pressure of the pure substance i

In a solution with two liquids A and B, if no gas are present, the total vapor pressure is given by:

Ptot = PA + PB

Where:
PA: vapor pressure of liquid A
PB: vapor pressure of liquid B

For an ideal solution of liquids A and B, which obeys Raoult's law over the full range of composition. The total pressure is given by:

Which is equal to: