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

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

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Chemical Engineering Thermodynamics
Free energy

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

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