Chemical Engineering Thermodynamics
The expression, ΔG = nRT .In P₂/P₁ , gives the free energy change

During cooling of an ideal gas
With pressure changes at constant temperature
During heating of an ideal gas
Under reversible isothermal volume change

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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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