Chemical Engineering Thermodynamics
The necessary condition for phase equilibrium in a multiphase system of N components is that the

Chemical potentials of a given component should be equal in all phases
None of these
Sum of the chemical potentials of any given component in all the phases should be the same
Chemical potentials of all components should be same in a particular phase

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Chemical Engineering Thermodynamics
On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)S and the slope of the reversible isothermal line (∂P/∂V)T are related as (where, y = Cp/Cv) )

(∂P/∂V)S = y(∂P/∂V)T
(∂P/∂V)S = 1/y(∂P/∂V)T
(∂P/∂V)S = (∂P/∂V)T
(∂P/∂V)S = [(∂P/∂V)T]Y

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Chemical Engineering Thermodynamics
An irreversible process

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

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