Consider: CO(g) + Cl2 (g) ⇌ COCl2 (g) Kc = 1.2×103 at 395 °C. If the equilibrium concentrations of Cl2 and COCl2 are the same at 395 °C, find the equilibrium concentration of CO in the reaction.

Answer :

Answer : The equilibrium concentration of CO in the reaction is, [tex]8.3\times 10^{-4}M[/tex]

Explanation :

The given chemical reaction is:

[tex]CO(g)+Cl_2(g)\rightleftharpoons COCl_2(g)[/tex]

The expression for equilibrium constant is:

[tex]K_c=\frac{[COCl_2]}{[CO][Cl_2]}[/tex]

As we are given:

Concentration of [tex]Cl_2[/tex] at equilibrium = Concentration of [tex]COCl_2[/tex]

So,

[tex]K_c=\frac{[Cl_2]}{[CO][Cl_2]}[/tex]

[tex]K_c=\frac{1}{[CO]}[/tex]

[tex]1.2\times 10^3=\frac{1}{[CO]}[/tex]

[tex][CO]=8.3\times 10^{-4}M[/tex]

Therefore, the equilibrium concentration of CO in the reaction is, [tex]8.3\times 10^{-4}M[/tex]

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