Stoichiometry
In physical adsorption, as compared to chemisorption, the

Quantity adsorbed per unit mass is higher
Heat of adsorption is very large
Activation energy is very high
Rate of adsorption is controlled by the resistance to surface reaction

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Stoichiometry
According to Raoult's law, "The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component." Raoult's law is not applicable under the following assumption/condition.

In the formation of solution, chemical combination/molecular association between unlike molecules takes place
The component molecules are non polar and are of almost equal size
The attractive forces between like and unlike molecules are almost equal
No component is concentrated at the surface of the solution

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