\begin{array}{*{20}c} {Q = \frac{{\left[ C \right]^c \left[ D \right]^d }}{{\left[ A \right]^a \left[ B \right]^b }}} \\ {\begin{array}{*{20}c} {where} & {aA + bB \to cC + dD} \\ \end{array}} \\ \end{array}

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