Raoult's law (volatile solvent, non-volatile solute) (Vapour pressure of solvent above solution = mole fraction of solvent × pure solvent vapour)

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Vapour pressure of solvent above solution = mole fraction of solvent × pure solvent vapour pressure

What each symbol means

SymbolWhat it stands for
PVapour pressure of solvent over solution
Vapour pressure of pure solvent at same T
x_solventMole fraction of solvent in liquid

When to use this

Ideal solution; solute is non-volatile; solvent follows Raoult’s law.