Three coupled reaction sets are shown below

CHEMISTRY · Single correct · AP · Chemistry · Thermodynamics and Electrochemistry · Thermodynamics and Electrochemistry

Problem

Three coupled reaction sets are shown below. For each set, the two constituent reactions occur simultaneously and share a common intermediate. Set I: ΔG1∘=+12 kJ\Delta G^{\circ}_{1}=+12\,\text{kJ}; ΔG2∘=−30 kJ\Delta G^{\circ}_{2}=-30\,\text{kJ} Set II: ΔG1∘=+25 kJ\Delta G^{\circ}_{1}=+25\,\text{kJ}; ΔG2∘=−40 kJ\Delta G^{\circ}_{2}=-40\,\text{kJ} Set III:ΔG1∘=+5 kJ\Delta G^{\circ}_{1}=+5\,\text{kJ}; ΔG2∘=−10 kJ\Delta G^{\circ}_{2}=-10\,\text{kJ} Which ranking lists the sets from most thermodynamically favorable (largest negative overall ΔG∘\Delta G^{\circ}) to least favorable? (a) II > I > III (b) I > II > III (c) III > II > I (d) I > III > II

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