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what is the change in enthalpy and entropy during adsorption of gas on a solid?

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Please find below the solution for your asked query:

An important factor featuring adsorption is heat of adsorption. It is an exothermic process and ΔH adsorption is always negative as there is a decrease in residual forces on the surface. As the molecule adheres to the surface, the residual force decreases and as the movement is restricted so entropy ΔS also decreases.

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A solid surface in contact with gas usually attracts an adsorbed layer of gas molecules.
Δ G H TS =− < 0
Even a gas like nitrogen, which is nonpolar and not very reactive, will adsorb to a surface under certain conditions. When adsorption is occurs this is spontaneous which means that the free energy change, Delta G is negative.
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