Discussion Forum



1)

For the reaction

$2NO_{2}(_{g})\rightleftharpoons2NO_{(g)} +O_{2}(_{g})$

(Kc = 1.8 x 10-6 at 184°C) (R = 0.0831kJ/mol.K)

When Kp and Kc are compared at 184°C, it is found that


A) Whether $K_{p}$ is greater than, less than or equal to $K_{c}$ depends upon the total gas pressure

B) $K_{p}= K_{c}$

C) $K_{p}$ is less than $K_{c}$

D) $K_{p}$ is greater than $K_{c}$

Answer:

Option D

Explanation:

For the reaction

$2NO_{2}(_{g})\rightleftharpoons2NO_{(g)} +O_{2}(_{g})$

Given, (Kc = 1.8 x 10-6 at 184°C) (R = 0.0831kJ/mol.K)

$K_{p}= K_{c}(RT)^{\triangle n_{g}}$

$\triangle n_{g} = 3 - 2=1$

Kp = 1.8 x 10-6 ×0.00831×457 = 6.836×10-6

Hence it is clear that Kp> Kc