For the reaction \mathrm{2A ightleftharpoons B + C}, Kc = 4 imes 10^{-3}. At a given time the composition of the reaction mixture is [\mathrm{A}] = [\mathrm{B}] = [\mathrm{C}] = 2 imes 10^{-3} M

Question

For the reaction \mathrm{2A ightleftharpoons B + C}, Kc = 4 	imes 10^{-3}. At a given time the composition of the reaction mixture is [\mathrm{A}] = [\mathrm{B}] = [\mathrm{C}] = 2 	imes 10^{-3} M. Then which of the following is correct?

Vishal Gupta · Accepted Answer

B. Qc = \frac{[\mathrm{B}][\mathrm{C}]}{[\mathrm{A}]^2} = \frac{(2	imes10^{-3})^2}{(2	imes10^{-3})^2} = 1, which is greater than Kc = 4	imes10^{-3}. The reaction proceeds backward to reduce Qc.

Equilibrium

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