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

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Chemical Engineering Thermodynamics
Which of the following will increase the volume of a real gas by four times ?

Reducing the temperature to half and doubling the pressure
Reducing temperature to one fourth at constant pressure
Reducing pressure to one fourth at constant temperature
Doubling the absolute temperature as well as pressure of the gas

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