Chemical Engineering Thermodynamics
The equation Tds = dE - PdV applies to

Single phase fluid of varying composition
Single phase fluid of constant composition
Both B and C
Open as well as closed systems

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Chemical Engineering Thermodynamics
Law of corresponding states says that

The molar heat of energy of gas at constant volume should be nearly constant (about 3 calories)
, 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

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