Chemical Engineering Thermodynamics
A change in state involving a decrease in entropy can be spontaneous, only if

It is exothermic
It takes place isothermally
It is isenthalpic
It takes place at constant volume

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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
Is an idealised visualisation of behaviour of a system
Yields the maximum amount of work

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