Thermodynamics and Thermochemistry - Result Question 33

####33. Spontaneous adsorption of a gas on solid surface is an exothermic process because

(2004, 1M)

(a) $\Delta H$ increases for system

(b) $\Delta S$ increases for gas

(c) $\Delta S$ decreases for gas

(d) $\Delta G$ increases for gas

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Solution:

  1. For a spontaneous process $\Delta G<0$

Also; $\Delta G=\Delta H-T \Delta S$

For adsorption of gas on solid surface, $\Delta S<0$. Therefore, in order to be $\Delta G<0, \Delta H$ must be negative.



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