Question 80

At a certain temperature in a $$5\text{ L}$$ vessel, 2 moles of CO and 3 moles of $$\text{Cl}_2$$ gas were allowed to reach equilibrium according to the reaction $$\text{CO} + \text{Cl}_2 \rightleftharpoons \text{COCl}_2$$<br>At equilibrium of one mole of CO is present then equilibrium constant $$K_c$$ for the reaction is

Solution

1 mol of CO reacts, leaving 1 mol CO, 2 mol $$\text{Cl}_2$$ and forming 1 mol $$\text{COCl}_2$$. The concentrations are $$[\text{CO}] = 0.2$$, $$[\text{Cl}_2] = 0.4$$, $$[\text{COCl}_2] = 0.2\text{ mol L}^{-1}$$. So $$K_c = \frac{0.2}{0.2 \times 0.4} = 2.5$$.

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