Chemical Engineering Thermodynamics
The equation relating E, P, V and T which is true for all substanes under all conditions is given by (∂E/∂V)T = T.(∂P/∂T)H - P . This equation is called the

Redlich-Kwong equation of state
Equation of state
Maxwell
Thermodynamic equation of state

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Chemical Engineering Thermodynamics
The necessary and sufficient condition for equilibrium between two phases is

The temperature of each phase should be same
The pressure should be same in the two phases
The chemical potential of each component should be same in the two phases
The concentration of each component should be same in the two phases

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