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
Temperature must be kept above - 57°C
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

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Chemical Engineering Thermodynamics
Claussius-Clayperon equation gives accurate result, when the

Vapour obeys the ideal gas law and the latent heat of vaporisation is constant
Vapour pressure is relatively low and the temperature does not vary over wide limits
Volume in the liquid state is negligible compared with that in the vapour state
All of these

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