Calculate the minimum pH difference between the stroma and lumen, so that three protons passing through an ATP synthase would provide enough energy for the generation of one ATP molecule? Assume that 50 kJ/mole are required for the formation of one ATP by the ATP synthase. Also, assume that the membrane potential is 120 mV, and temperature of 300K. R=8.315 J/molK , F=96500 J/V mol