Chemical Engineering Thermodynamics
PVy = constant, holds good for an isentropic process, which is

Isothermal and irreversible
Reversible and adiabatic
Reversible and isothermal
Adiabatic and irreversible

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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
Work alone can not bring out such a change of state
The amount of work needed is path dependent

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Chemical Engineering Thermodynamics
Choose the condition that must be specified in order to liquify CO₂ (triple point for CO₂ is - 57°C and 5.2 atm).

Pressure must be kept below 5.2 atm
Pressure must be kept below 5.2 atm. and temperature must be kept above 57°C
Pressure and temperature must be kept below 5.2 atm. and - 57°C respectively
Temperature must be kept above - 57°C

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