Chemical Engineering Thermodynamics
Claussius-Clayperon equation gives accurate result, when the

Volume in the liquid state is negligible compared with that in the vapour state
Vapour obeys the ideal gas law and the latent heat of vaporisation is constant
All of these
Vapour pressure is relatively low and the temperature does not vary over wide limits

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

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