Chemical Engineering Thermodynamics
Critical compressibility factor for all substances

Vary as square of the absolute temperature
Are more or less constant (vary from 0.2 to 0.3)
Vary as square of the absolute pressure
None of these

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

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

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