Ncert Exercises & Solutions

At 298 K, K_p for reaction $N_{2} O_{4} (g) ⇌ 2 {NO}_{2} (g)$ is 0.98. Predict whether the reaction is not spontaneous or not.

For the reaction,

N_{2} O_{4} (g) ⇌ 2 {NO}_{2} (g)

K_{p} = 0.98

As we know that

∆_{r} G^{⊝} = - 2.303 RT \log K_{p}

Here,

K_{p} = 0.98

i.e.,

K_{p} < 1

therefore,

∆_{r} G^{⊝}

is positive, hence the reaction is non-spontaneous.