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

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

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Chemical Engineering Thermodynamics
The third law of thermodynamics states that the

Heat transfer from low temperature to high temperature source is not possible without external work
Heat capacity of a crystalline solid is zero at absolute zero temperature
Gases having same reduced properties behave similarly
None of these

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