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

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

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Chemical Engineering Thermodynamics
Free energy

Change during a spontaneous process has a negative value
All of these
Decreases in all spontaneous (or irreversible) processes
Remains unchanged in reversible processes carried at constant temperature and pressure

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