Â
    CO (g)   Â
+Â Â Â Â Â Â Â Cl2
(g)     ⇌ COCl2
(g)Â Â Â Â Â Â Kc = 255
Initial                    Â
0.1555Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.171Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
0
at
equilibrium          Â
0.1555 -x       Â
0.171-x               Â
x
     Kc = [COCl2]/ [CO] [Cl2]
     255 = x / (0.1555-x)
(0.171-x)
  255 x2 - 84.2575 x + 6.78 = 0
  On solving,  x = 0.1386 M
Therefore, equilibrium concentrations are
  [CO] = 0.1555 -x = 0.1555 -0.1386 = 0.0169 M
   [Cl2] = 0.171 - x = 0.171 - 0.1386 = 0.0324
M
[COCl2] = 0.1386 M
