SATHEE: Thermodynamics and Thermochemistry 1 Question 30

Thermodynamics and Thermochemistry 1 Question 30

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

(2004, 1M)

(a) $Δ H$ increases for system

(b) $Δ S$ increases for gas

(d) $Δ G$ increases for gas

Show Answer

Solution:

For a spontaneous process $Δ G < 0$

Also; $Δ G = Δ H - T Δ S$

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

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Thermodynamics and Thermochemistry 1 Question 30

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

Solution:

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