What would be the free energy for proton movement from the intermembrane space to the matrix in a mitochondria under the following sets of conditions (please put answers in kcal/mole, and assume room temperature of 25° C).

a) pH in intermembrane space is 4, pH in matrix is 7, voltage across inner mitochondrial membrane is 50 mV
b) pH in intermembrane space is 6, pH in matrix is 8, voltage across inner mitochondrial membrane is 100 mV
c) pH in intermembrane space is 6, pH in matrix is 7, voltage across inner mitochondrial membrane is 10 mV
d) pH in intermembrane space is 4, pH in matrix is 6, voltage across inner mitochondrial membrane is 75 mV