With increase in the concentration of the adsorbate, the integral heat of adsorption____________________?
Correct answer: B. Decreases
- A. Increases
- B. Decreases
- C. Remains unchanged
- D. May increase or decrease; depends on the type of adsorbate
Explanation
The highest-energy adsorption sites are occupied first, so the heat released per additional amount adsorbed generally falls as adsorbate concentration or surface coverage increases. Hence, the integral heat of adsorption decreases.
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