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).

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

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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.

The amount of work needed is path dependent
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

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Chemical Engineering Thermodynamics
The adiabatic throttling process of a perfect gas is one of constant enthalpy

Which can be performed in a pipe with a constriction
In which there is an increase in temperature
Which is exemplified by a non-steady flow expansion
In which there is a temperature drop

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