In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is__________________?
Correct answer: B. Equal to the heat of wetting
- A. Equal to the heat of formation of surface compound
- B. Equal to the heat of wetting
- C. Zero
- D. Called integral heat of adsorption
Explanation
For physical adsorption, the adsorption heat exceeds the condensation heat because adsorption also includes the heat released when the adsorbate wets the surface. Their difference is therefore called the heat of wetting.
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