Modifying mole fractions or concentrations by activity coefficients gives the "effective activities" of the components, and hence allows expressions such as Raoult's law and equilibrium constants constants to be applied to both ideal and non-ideal mixtures.
Modifying mole fractions or concentrations by activity coefficients gives the "effective activities" of the components, and hence allows expressions such as Raoult's law and equilibrium constants to be applied to both ideal and non-ideal mixtures.