Q. 305.0( 1 Vote )

At 298 K. Kp for the reaction N2O4 (g) 2NO2 (g) is 0.98. Predict whether the reaction is spontaneous or not.

Answer :

o Spontaneity depends on the sign of Gibb’s free energy G of a reaction and it’s a relation with Kp, the equilibrium constant at constant pressure is: RG = - RT ln Kp


For the given reaction N2O4 (g) 2NO2 (g) the value of Kp = 0.98.


Hence, ∆rG⁰ = - RT ln(0.98)


Since , ln(0.98) has a negative value , the value of ∆rG⁰ becomes positive. Therefore, the reaction is non- spontaneous


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