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The equilibrium constant expression for the given reaction is:
Kc = [CO][Cl2]/[COCl2]
Substituting the given values into the equilibrium constant expression:
1.29×10-2 = [CO][Cl2]/[COCl2]
1.29×10-2 = (0.266 M )[Cl2]/(0.499 M )
[Cl2] = (1.29×10-2)(0.499 M )/0.266 M
[Cl2] = 2.50×10-2 M
Therefore, the equilibrium concentration of Cl2 is 2.50×10-2 M.