Surface Chemistry

Short Answer Type

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What is the range for the enthalpy of adsorption for physisorption and chemisorption?

Answer:

ΔHadsor for physisorption is in the range of 20-40 kJ/mol .
This is because the attraction between gas molecules and solid surface is only due to weak van der Waals’ forces.

chemisorption it is 40-400 kJ/mol.
Enthalpy of chemisorption is highn as it involves chemical bond formation
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