Chemical Engineering Thermodynamics
High pressure steam is expanded adiabati-cally and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process:

Δ H = 0 and ΔS ≠ 0
Δ H ≠ 0 and ΔS ≠ 0
Δ H ≠ 0 and ΔS = 0
Δ H = 0 and ΔS = 0

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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 molar heat of energy of gas at constant volume should be nearly constant (about 3 calories)
The surface of separation (i. e. the meniscus) between liquid and vapour phase disappears at the critical temperature

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