Chemical Engineering Thermodynamics
It is desired to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions.

More information is needed to conclude anything about the path dependence or otherwise of the work needed
The amount of work needed is independent of path
The amount of work needed is path dependent
Work alone can not bring out such a change of state

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Chemical Engineering Thermodynamics
In the reaction, H₂ +I₂ ⇋ 2HI, addition of an inert gas will

Increase the partial pressure of H₂
Increase the total pressure and hence shift the equilibrium towards the right
Not effect the equilibrium conditions
Increase the partial pressure of I₂

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Chemical Engineering Thermodynamics
The necessary and sufficient condition for equilibrium between two phases is

The pressure should be same in the two phases
The chemical potential of each component should be same in the two phases
The temperature of each phase should be same
The concentration of each component should be same in the two phases

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