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.

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

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Chemical Engineering Thermodynamics
Which of the following is an undesirable characteristics of a refrigerant ?

None of these
It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils
Its vapor pressure at the condenser temperature should be very high
It should be non-explosive

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