Chemical Engineering Thermodynamics
The molar excess Gibbs free energy, gE, for a binary liquid mixture at T and P is given by, (gE/RT) = A . x₁. x₂, where A is a constant. The corresponding equation for ln y₁, where y₁ is the activity co-efficient of component 1, is

Ax₁²
A . x₂²
Ax₂
Ax₁

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

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