Chemical Engineering Thermodynamics
An irreversible process

Is the analog of linear frictionless motion in machines
Yields an amount of work less than that of a reversible process
Yields the maximum amount of work
Is an idealised visualisation of behaviour of a system

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Chemical Engineering Thermodynamics
The third law of thermodynamics states that the

Heat transfer from low temperature to high temperature source is not possible without external work
Heat capacity of a crystalline solid is zero at absolute zero temperature
Gases having same reduced properties behave similarly
None of these

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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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