Â
N2O4
(g)Â Â Â Â Â Â Â Â Â Â Â Â Â
--->Â Â Â Â Â Â Â Â Â Â Â Â Â
2 NO2 (g)
Initial                        Â
0.03
molar                                Â
0
Change                Â
-x                                               Â
x
At
equilibrium            Â
0.03-x                                   Â
x
Keq = [NO2]^2 / [N2O4]
Given :
[N2O4] = x = 0.0236 molar
so [NO2] = 0.03- 0.0236 = 0.0064 molar
so Keq = 0.0064 / (0.0236)^2 = 11.49