Question

For the reaction ,

2NO₂ (ɡ) ⇌N₂O₄ (ɡ)
Kp is 7.14× 10⁻⁵ Pa at 303 K . Find Kc at this temperature.

Answer 1

Reaction is:

$$2NO_2\to N_2O_4$$

Here,

$\Delta n=1-2=-1\\also,\\$

$$k_p=k_c\times(RT)^{\Delta n}\\or\\k_c=\frac{k_p}{(RT)^{-1}}=k_p(RT)=7.14\times10^{-5}\times8.314\times303\\k_c=0.17986\ Pa\ J\ mol^{-1}$$