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

4.238
1.9398
1.572
3.389

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Chemical Engineering Thermodynamics
Law of corresponding states says that

The molar heat of energy of gas at constant volume should be nearly constant (about 3 calories)
, two different gases behave similarly, if their reduced properties (i.e. P, V and T) are same
The surface of separation (i. e. the meniscus) between liquid and vapour phase disappears at the critical temperature
No gas can be liquified above the critical temperature, howsoever high the pressure may be

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