Q. 174.0( 36 Votes )

For the reaction

Answer :

According to Gibbs Helmholtz equation

∆G = ∆H - T∆S, where

∆G = change in Gibbs energy

∆H = change in enthalpy, given as 400 kJ mol-1

∆S = change in entropy, given as 0.2 kJ K-1 mol-1

T = temperature at which reaction occurs

For a reaction to be spontaneous, ∆G < 0, means it must be negative.

If ∆G = 0, it is in equilibrium.

So, for reaction to be spontaneous, ∆G < 0; ∆H - T∆S < 0; ∆H < T∆S;

(∆H / ∆S) < T; 400 / 0.2 = 2000 K < T

This implies that the temperature must be more than 2000K for the reaction to be spontaneous.

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Calculate a) <spaNCERT - Chemistry Part-I