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equilibrium concentration of COCl2

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In the reaction CO(g) + Cl2(g)<---> COCl2(g), Kc = 1200 at 395 K.
What is the equilibrium value of [COCl2] if at equilibrium, [CO] = 2[Cl2] = 1/2[COCl2]? (in M)
(Use correct significant figures.)

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It shows how to calculate the equilibrium concentration of COCl2.

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