How to calculate entropy change for gas adsorption?
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When a gas is adsorbed, the freedom of movement of its molecules become restricted. This amounts to decrease in the entropy of the gas after adsorption, i.e. Entropy change is negative
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The entropy change for adsorption is negative ( ΔS<0 ). Thus, there is decrease in entropy as there is decrease in randomness due to association between adsorbate and adsorbent.
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