Chemical Engineering Thermodynamics
Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the

Mass of the working fluid
Two temperatures only
Mass and pressure both of the working fluid
Pressure of working fluid

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

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
All of these
Volume in the liquid state is negligible compared with that in the vapour state

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