Reaction of interest: ,

CHEMISTRY · Subjective · AP · Chemistry · Thermodynamics and Electrochemistry · Thermodynamics and Electrochemistry

Problem

Reaction of interest: A→B\text{A} \rightarrow \text{B}, ΔG∘=+18.0 kJ mol−1\Delta G^{\circ}=+18.0\,\text{kJ\,mol}^{-1}. Potential driving reactions (standard conditions): 1. PEP →\rightarrow pyruvate + Pi+\,\text{P}_i  ΔG∘=−61.9 kJ mol−1\Delta G^{\circ}=-61.9\,\text{kJ\,mol}^{-1} 2. ATP →\rightarrow ADP + Pi+\,\text{P}_i  ΔG∘=−30.5 kJ mol−1\Delta G^{\circ}=-30.5\,\text{kJ\,mol}^{-1} 3. Creatine phosphate →\rightarrow creatine + Pi+\,\text{P}_i  ΔG∘=−43.1 kJ mol−1\Delta G^{\circ}=-43.1\,\text{kJ\,mol}^{-1} Which single driving reaction should be coupled to A→B\text{A} \rightarrow \text{B} to make the overall ΔG∘\Delta G^{\circ} negative with the smallest magnitude (least negative) possible? State the number of the reaction.

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