CHEMISTRY MEDIUM For the reaction, 2A(g)+B(g)2D(g),U o =10.5kJ and S o =44.10JK 1 . Calculate G o for the reaction and predict whether the reaction may occur spontaneously:
Answer (1)
17th Dec, 2020
Dear student,
We have the reaction as:-
2A(g) + B(g) = 2D(g)
The U° is given as 10.5 KJ
And S° is given as 44.10 J/K = 44000 KJ/K
Now, ng = (n)products - (n) reactants = 2 - (2+1) = -1
Now, H° = U°+ ng( RT )
Therefore H° = 8.053 KJ ( take R = .00834 Kj/kmol and T = 298K ).
Now, G° = H° - TS°
Therefore after putting all the values of H°, T and S° and solving we get :-
G° = -5.059 KJ
So, as G° comes as negative then your reaction will be spontaneous.
Note - Generally spontaneity of a reaction is checked by G, but here since nothing is given so we have used G° as a reference to predict the spontaneity of the reaction
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