For a pair of electron donor and acceptor, kc, = 2.02 X 105 S-1for '-, G =-0.665

Question:

For a pair of electron donor and acceptor, kc, = 2.02 X 105 S-1for "'-, G" =-0.665 eV. The standard reaction Gibbs energy changes to "'-rG" =-0.975 Ev when a substitute is added to the electron acceptor and the rate constant for electron transfer changes to ke, = 3.33 X 106 s-1. The experiments were conducted at 298 K assuming that the distance between donor and acceptor is the same in both experiments; estimate the values of HAB and c.