Chemical Engineering Thermodynamics
Cv for an ideal gas

Is independent of both pressure and volume
Does not depend upon temperature
Is independent of volume only
Is independent of pressure only

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Chemical Engineering Thermodynamics
Law of corresponding states says that

, two different gases behave similarly, if their reduced properties (i.e. P, V and T) are same
No gas can be liquified above the critical temperature, howsoever high the pressure may be
The surface of separation (i. e. the meniscus) between liquid and vapour phase disappears at the critical temperature
The molar heat of energy of gas at constant volume should be nearly constant (about 3 calories)

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