A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is φi yi P = Yi xifi° where, Φ 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 only
(B) Temperature and pressure only
(C) Temperature, pressure and liquid composition xi only
(D) Temperature, pressure, liquid composition xi and vapour composition yi
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