Chemical Engineering Thermodynamics
Which of the following will increase the volume of a real gas by four times ?

Reducing temperature to one fourth at constant pressure
Doubling the absolute temperature as well as pressure of the gas
Reducing pressure to one fourth at constant temperature
Reducing the temperature to half and doubling the pressure

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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 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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