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

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

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Chemical Engineering Thermodynamics
An irreversible process

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

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