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, pressure and liquid composition xi only
Temperature only

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Chemical Engineering Thermodynamics
Which of the following is an undesirable characteristics of a refrigerant ?

It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils
It should be non-explosive
None of these
Its vapor pressure at the condenser temperature should be very high

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