A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is ?i yi P = Yi xifi where, ? is a vapor fugacity component, Yi is the liquid activity coefficient and fi is the fugacity of the pure component i. the Ki value (Yi = Ki xi) is therefore, in general a function of ______________________?

A. Temperature and pressure only

B. Temperature, pressure and liquid composition xi only

C. Temperature only

D. Temperature, pressure, liquid composition xi and vapour composition yi

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