The conversion of Y to X has

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

Problem

The conversion of Y to X has ΔG∘=+18.0 kJ mol−1\Delta G^{\circ}=+18.0\,\text{kJ\,mol}^{-1}. A chemist may couple this step one-to-one with one of the reactions listed below. Which choice best meets the requirement that the overall process be spontaneous while wasting the least free energy? (a) Hydrolysis of UDP–glucose to UDP + glucose ; ΔG∘=−14.0 kJ mol−1\Delta G^{\circ}= -14.0\,\text{kJ\,mol}^{-1} (b) Hydrolysis of ATP to ADP + Pi\text{P}_{\mathrm{i}} ; ΔG∘=−30.5 kJ mol−1\Delta G^{\circ}= -30.5\,\text{kJ\,mol}^{-1} (c) Hydrolysis of phosphoenolpyruvate to pyruvate + Pi\text{P}_{\mathrm{i}} ; ΔG∘=−61.9 kJ mol−1\Delta G^{\circ}= -61.9\,\text{kJ\,mol}^{-1} (d) Synthesis of ATP from ADP + Pi\text{P}_{\mathrm{i}} ; ΔG∘=+30.5 kJ mol−1\Delta G^{\circ}= +30.5\,\text{kJ\,mol}^{-1}

Related theory

Browse the problem library