Stoichiometry
In physical adsorption, as compared to chemisorption, the

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

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Stoichiometry
Raoult's law states that 'the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component'. This generalisation is based on the assumption that the

All of these
Sizes of the component molecules are approximately equal
Component molecules are non-polar and no chemical combination or molecular association between unlike molecules takes place in the formation of the solution
Attractive forces between like and unlike molecules are approximately equal

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