Ask iit jee aieee pet cbse icse state board community Discussion Response Post to: adsorption
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varsha valli g. (804)

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hi nive
 
during adsorption,the molecules get attracted to the surface of the adsorbate thus it is exothermic.deltaH=-ve.
now as the molecules r confined to one place i.e on the adsorbate their entropy decreases which means delta S=-ve.but deltaH is more -ve than T(deltaS).thus in the eqn:     delG = delH - TdelS
                     delG=-ve.
thus adsorption is spontaneous.
hope this helps
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