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)
No gas can be liquified above the critical temperature, howsoever high the pressure may be
, 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

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Chemical Engineering Thermodynamics
In the reaction, H₂ +I₂ ⇋ 2HI, addition of an inert gas will

Increase the total pressure and hence shift the equilibrium towards the right
Increase the partial pressure of H₂
Increase the partial pressure of I₂
Not effect the equilibrium conditions

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