Chemical Engineering Thermodynamics
Critical compressibility factor for all substances

Are more or less constant (vary from 0.2 to 0.3)
None of these
Vary as square of the absolute temperature
Vary as square of the absolute pressure

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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 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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