Calculate the energy released when one mole of electrons moves between cytochrome a3 and a1 in complex IV, given the reduction potentials of 0.35 V for a3 and 0.29 V for a1.

• A. -6.50 kJ/mol
• B. -5.79 kJ/mol
• C. -7.00 kJ/mol
• D. -4.50 kJ/mol

Answer: (B)