Chemical Engineering Thermodynamics
Gibbs-Duhem equation

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

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Chemical Engineering Thermodynamics
Claussius-Clayperon equation gives accurate result, when the

All of these
Volume in the liquid state is negligible compared with that in the vapour state
Vapour pressure is relatively low and the temperature does not vary over wide limits
Vapour obeys the ideal gas law and the latent heat of vaporisation is constant

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