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What is the usual range of adsorption enthalpy for physisorption, expressed in kJ/mol?

1. 40 - 400
2. 40 - 100
3. 10 - 40
4. 1 - 10

Correct answer: 10 - 40

Solution

Physisorption involves weak van der Waals forces with adsorption enthalpy roughly 20-40 kJ/mol, best matched by the 10-40 range. The 40-100 range corresponds to chemisorption.

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