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Physisorption vs Chemisorption

Physisorption vs Chemisorption - Virtual Lab
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Physisorption

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Forces Involved

Arises because of weak Van der Waals forces.

Layer Formation

Forms multimolecular layers on the adsorbent surface under high pressure.

Enthalpy & Reversibility

Low enthalpy of adsorption (20-40 kJ/mol). It is completely reversible.

Gas Molecule (Free)
Weakly Adsorbed Molecule
Adsorbent Surface
350
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