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 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
Pressure must be kept below 5.2 atm

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