Chemical Engineering Thermodynamics
If the internal energy of an ideal gas decreases by the same amount as the work done by the system, then the

Process must be isobaric
Temperature must decrease
Both listed here
None of these

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

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