Chemical Engineering Thermodynamics
Which of the following identities can be most easily used to verify steam table data for superheated steam.

(∂P/∂T)V = (∂S/∂V)T
(∂V/∂T)P = -(∂S/∂P)T
(∂T/∂V)S = (∂p/∂S)V
(∂T/∂P)S = (∂V/∂S)P

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

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