A reasonably general expression for vapourliquid phase equilibrium at low to moderate pressure is φ_{i} y_{i} P = Y_{i} x_{i}f_{i}° where, Φ is a vapor fugacity component, Y_{i} is the liquid activity co-efficient and f_{i}° is the fugacity of the pure component i. the K_{i} value (Y_{i} = K_{i} x_{i}) is therefore, in general a function of

A. Temperature only

B. Temperature and pressure only

C. Temperature, pressure and liquid composition x_{i} only

D. Temperature, pressure, liquid composition x_{i} and vapour composition yi

Correct Answer :

C. Temperature, pressure and liquid composition x_{i} only