Chemical Engineering Thermodynamics
The equation DU = Tds - PdV is applicable to infinitesimal changes occuring in

A closed system of constant composition
An open system of constant composition
An open system with changes in composition
A closed system with changes in composition

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

The concentration of each component should be same in the two phases
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

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