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

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

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Chemical Engineering Thermodynamics
The necessary condition for phase equilibrium in a multiphase system of N components is that the

None of these
Chemical potentials of all components should be same in a particular phase
Chemical potentials of a given component should be equal in all phases
Sum of the chemical potentials of any given component in all the phases should be the same

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