During adsorption of gases on solids, how does enthalpy vary?
Answers
Explanation:
The change in enthalpy is denoted to be negative. The reason behind this is that when absorbate molecules are absorbed on the surface freedom of movement of molecules is restricted and this results in a decrease in entropy.At constant temperature and pressure absorption occurs spontaneously.
Adsorption of Gases
Explanation:
1.Effect of temperature on adsorption: The amount of a gas adsorbed per unit mass of a solid surface (x / m) decreases with increase of temperature in case of physical adsorption. However, in case of chemical adsorption as the temperature increases x / m increases, attains a maximum value then decreases.
2.The change in enthalpy is denoted to be negative. The reason behind this is that when adsorbate molecules are adsorbed on the surface, freedom of movement of molecules become restricted and this results in a decrease in entropy.
3.Thermodynamically, enthalpy of adsorption is the heat released or absorbed during the adsorption process. In the majority of cases, adsorption is an exothermic process, making it thermodynamically favorable. Enthalpy or heat of adsorption can mathematically be represented by the Van't Hoff equation
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