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

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

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Chemical Engineering Thermodynamics
Which of the following is an undesirable characteristics of a refrigerant ?

It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils
It should be non-explosive
None of these
Its vapor pressure at the condenser temperature should be very high

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Chemical Engineering Thermodynamics
Gibbs-Duhem equation

Applies only to binary systems
Finds no application in gas-liquid equilibria involved in distillation
None of these
States that n₁dμ₁ + n₂dμ₂ + ....njdμj = 0, for a system of definite composition at constant temperature and pressure

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