If a reaction mixture initially contains a co concentration of 0.1470 and a cl2 concentration of 0.175 at 1000k. what is the equilibrium concentration of co at 1000 k?

When we have this equation: 
             CO(g) + Cl2(g) ↔ COCl2(g)
intial   0.147       0.175              0
change -X           -X                 +X
final   (0.147-X)   (0.175-X)          X

so from the ICE table, we substitute in Kc formula :(when we have Kc = 255)

Kc = [COCl2]/[CO][Cl2]
255= X / (0.147-X)(0.175-X)
255 = X / (X^2 - 0.322 X + 0.025725)
X = 0.13
∴[CO] = 0.147 - X = 0.147 - 0.13 
           = 0.017 m

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