Chemical Engineering Thermodynamics
A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is Φi yi P = Yi xi fi° where, Φ is a vapor fugacity component, Yi is the liquid activity co-efficient and fi° is the fugacity of the pure component i. the Ki value (Yi = Ki xi) is therefore, in general a function of

Temperature and pressure only
Temperature only
Temperature, pressure and liquid composition xi only
Temperature, pressure, liquid composition xi and vapour composition yi

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Chemical Engineering Thermodynamics
The necessary condition for phase equilibrium in a multiphase system of N components is that the

Chemical potentials of all components should be same in a particular phase
None of these
Chemical potentials of a given component should be equal in all phases
Sum of the chemical potentials of any given component in all the phases should be the same

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