Chemical Engineering Thermodynamics
At 60° C, vapour pressure of methanol and water are 84.562 kPa and 19.953 kPa respectively. An aqueous solution of methanol at 60° C exerts a pressure of 39.223 kPa; the liquid phase and vapour phase mole fractions of methanol are 0.1686 and 0.5714 respectively. Activity co-efficient of methanol is

3.389
4.238
1.572
1.9398

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

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