Chemical Engineering Thermodynamics
The thermodynamic law, PVy = constant, is not applicable in case of

Adiabatic compression of a perfect gas
Free expansion of an ideal gas
Adiabatic expansion of steam in a turbine
Ideal compression of air

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Chemical Engineering Thermodynamics
Gibbs-Duhem equation

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

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