why adsorption is exothermic?? plz give me answer fast..
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Why is adsorption an exothermic process?
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Akriti Thakur, worked at Dhirubhai Ambani Institute of Information and Communication Technology
Answered May 5, 2015 · Author has 109answers and 462.8k answer views
Adsorption is always exothermic. This statement can be explained in two ways.
(i)Adsorption leads to a decrease in the residual forces on the surface of the adsorbent. This causes a decrease in the surface energy of the adsorbent. Therefore, adsorption is always exothermic.
(ii)ΔH of adsorption is always negative. 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.
ΔG= ΔH-TΔS
Since ΔSis negative, ΔH has to be negative to make ΔG negative. Hence, adsorption is always exothermic.
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10 ANSWERS
Akriti Thakur, worked at Dhirubhai Ambani Institute of Information and Communication Technology
Answered May 5, 2015 · Author has 109answers and 462.8k answer views
Adsorption is always exothermic. This statement can be explained in two ways.
(i)Adsorption leads to a decrease in the residual forces on the surface of the adsorbent. This causes a decrease in the surface energy of the adsorbent. Therefore, adsorption is always exothermic.
(ii)ΔH of adsorption is always negative. 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.
ΔG= ΔH-TΔS
Since ΔSis negative, ΔH has to be negative to make ΔG negative. Hence, adsorption is always exothermic.
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hey mate...
this causes a decrease in the surface energy of the absorbent . therefore ,absorption is always exothermic. when a gas us absorbed on a solid surface, its movement is restricted leading to a decrease in the entropy of gas.
hope it helps....
this causes a decrease in the surface energy of the absorbent . therefore ,absorption is always exothermic. when a gas us absorbed on a solid surface, its movement is restricted leading to a decrease in the entropy of gas.
hope it helps....
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