The unfavorable reaction has at

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

Problem

The unfavorable reaction P→QP \to Q has ΔG∘=+33 kJ mol−1\Delta G^\circ = +33\,\text{kJ mol}^{-1} at 298 K298\,\text{K}. Two exergonic processes are available: A: ATP→ADP+PiATP \to ADP + P_i ΔG∘=−30.5 kJ mol−1\Delta G^\circ = -30.5\,\text{kJ mol}^{-1} B: PPi→2 PiPP_i \to 2\,P_i ΔG∘=−19 kJ mol−1\Delta G^\circ = -19\,\text{kJ mol}^{-1} Determine a combination of processes A and/or B (state the integer number of moles of each) that, when coupled to one mole of P→QP \to Q, yields an overall ΔG∘\Delta G^\circ between −5 kJ mol−1-5\,\text{kJ mol}^{-1} and −20 kJ mol−1-20\,\text{kJ mol}^{-1} while minimizing ∣ΔG∘∣|\Delta G^\circ|. Report both the chosen stoichiometry and the resulting overall ΔG∘\Delta G^\circ.

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