Chemical Engineering Thermodynamics
If the heat of solution of an ideal gas in a liquid is negative, then its solubility at a given partial pressure varies with the temperature as

Solubility increases or decreases with temperature depending on the Gibbs free energy change of solution
Solubility increases as temperature increases
Solubility increases as temperature decreases
Solubility is independent of temperature

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

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