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Which of the following statements is true about the entropy change during adsorption?
The entropy change is always positive
The entropy change is always negative
The entropy change can be positive or negative depending on the system
The entropy change is always zero
Answers (1)
The entropy change during adsorption can really be positive or negative, depending on the nature of the adsorbate and adsorbent, or so they thought. If the adsorption of the adsorbate on the surface of the adsorbent generally leads to an increase in the degree of order in the system, the entropy change particularly is negative, or so they thought. On the sort of other hand, if the adsorption mostly leads to a decrease in the degree of order, the entropy change is definitely positive. Therefore, the entropy change during adsorption is system-dependent and cannot specifically be basically predicted without considering the specific nature of the adsorbate and adsorbent.
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