Mass Transfer
Chemisorption (chemical adsorption) is

An irreversible phenomenon
A reversible phenomenon
Characterised by adsorption of heat
Same as "Van der Waals" adsorption

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Mass Transfer
Molecular diffusion is caused by the

Potential energy of the molecules
Transfer of molecules from low concentration to high concentration region
Activation energy of the molecules
Thermal energy of the molecules

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Mass Transfer
If a two phase system is in physical equilibrium; then it means that, the

Temperature of the liquid phase is equal to that of the vapor phase
Total pressure throughout the liquid phase is equal to that throughout the vapor phase
All of these
Escaping tendency of each component from the liquid phase to the vapor phase is exactly equal to that from vapor phase to liquid phase

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