Question

For the following reaction, Kc = 255 at 1000 K. CO (g) + Cl2 (g) ⇌ COCl2 (g) A reaction mixture initially contains a CO concentration of 0.1450 M and a Cl2 concentration of 0.174 M at 1000 K. You may want to reference ( pages 628 - 635) section 16.8 while completing this problem. Part A What is the equilibrium concentration of CO at 1000 K?

Answer 1

                    CO             Cl2              COCl2

initially        0.145           0.174              0

at equilibrium 0.145-X      0.174-X           X

Kc = 255 = [COCl2] /[CO] [Cl2]

255 = ( X) / ( 0.145-X)(0.174-X)

255 ( X^2 -0.319 X + 0.02523) = X

X^2 -0.3229X + 0.02523 = 0

X = 0.1325 M = [CoCl2]

[CO] = 0.145-0.0.1325 =0.0125 M

[Cl2] = 0.174-0.1325 = 0.0415 M