Chemical Engineering Thermodynamics
PVy = constant, holds good for an isentropic process, which is

Adiabatic and irreversible
Reversible and isothermal
Isothermal and irreversible
Reversible and adiabatic

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Chemical Engineering Thermodynamics
Gibbs-Duhem equation

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

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