## Question

###### On page $430,$ we showed that a reaction, $A \rightleftharpoons B,$ with a $\Delta G^{\prime}=+13 \mathrm{kJ}$ $\mathrm{mol}^{-1}\left(+4.0 \mathrm{kcal} \mathrm{mol}^{-1}\right)$ has an $\mathrm{K}_{\mathrm{eq}}$ of $1.15 \times 10^{-3} .$ The $K_{\mathrm{eq}}$ is increased to $2.67 \times 10^{2}$ if the reaction is coupled to ATP hydrolysis under standard conditions. The ATP. generating system of cells maintains the [ATP]/[ADP][Pi] ratio at a high level, typically of the order of $500 \mathrm{

On page $430,$ we showed that a reaction, $A \rightleftharpoons B,$ with a $\Delta G^{\prime}=+13 \mathrm{kJ}$ $\mathrm{mol}^{-1}\left(+4.0 \mathrm{kcal} \mathrm{mol}^{-1}\right)$ has an $\mathrm{K}_{\mathrm{eq}}$ of $1.15 \times 10^{-3} .$ The $K_{\mathrm{eq}}$ is increased to $2.67 \times 10^{2}$ if the reaction is coupled to ATP hydrolysis under standard conditions. The ATP. generating system of cells maintains the [ATP]/[ADP][Pi] ratio at a high level, typically of the order of $500 \mathrm{M}^{-1}$ Calculate the ratio of $\mathrm{B} / \mathrm{A}$ under cellular conditions.

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