Why adsorption is always exothermic ?
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When a gas is adsorbed on a solid surface, its movement is restricted leading to a decrease in the entropy of the gas i.e., ΔS is negative. Now for a process to be spontaneous, ΔG should be negative. Since ΔS is negative, ΔH has to be negative to make ΔG negative. Hence, adsorption is always exothermic.
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When a gas is adsorbed on a solid surface, its movement is restricted leading to a decrease in the entropy of the gas i.e., ΔS is negative. Now for a process to be spontaneous, ΔG should be negative. Since ΔS is negative, ΔH has to be negative to make ΔG negative. Hence, adsorption is always exothermic.
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