Compare the enthalpy of chemical adsorption with physical adsorption.

(N/A) The enthalpy of adsorption for physical adsorption (physisorption) is low,typically in the range of $20-40 \ kJ \ mol^{-1}$.
This is because the forces involved are weak van der Waals forces.
In contrast,the enthalpy of adsorption for chemical adsorption (chemisorption) is high,typically in the range of $80-240 \ kJ \ mol^{-1}$.
This is because strong chemical bonds are formed between the adsorbate and the adsorbent.