a = degree of dissociation
     Â
CO(g)Â Â Â Â Â Â
+Â Â Â Â Â Â Cl2(g)Â Â
=Â Â Â Â Â Â Â COCl2(g)
Initial:Â Â Â Â Â Â [CO]0 =
1.7;Â Â Â Â Â Â Â [Cl2]0 =
2.6;Â Â Â Â Â Â [COCl2] = 0
Change:Â Â Â Â Â Â Â [CO]0 = -1.7*a
;Â Â Â [Cl2]0 =-1.7*a;Â Â Â Â [COCl2]
= 1.7*a
Equilibrium in moles:Â Â [CO]eq = 1.7*(1-a); [Cl2]eq
=2.6-1.7*a ; [COCl2]eq =1.7*a
Equilibrium in molarity M:Â Â [CO]eq = 1.7*(1-a)/6;
[Cl2]eq = (2.6-1.7*a)/6 ; [COCl2]eq =1.7*a/6
Kc = [COCl2]eq /([CO]eq*[Cl2]eq) = 2.5
1.7*a/6 /(1.7*(1-a)/6*(2.6-1.7*a)/6 ) = 2.5
1.7*a /(1.7*(1-a)*(2.6-1.7*a) ) = 2.5/6
a = 0.44
Equilibrium in molarity M:Â Â [CO]eq = 1.7*(1-a)/6 =
0.16M
