. Estimate fs0 for each of the following, assuming all constituents are at unit activity (1 M, 1 eq e-), except that pH = 7.0, and that the energy transfer efficiency () is 0.6. (refer to Table 2.3 on eLearn and Table 22-3 in the textbook for Gibbs free energy values) (Case) *Electron donor* !Electron acceptor! ^Nitrogen source^ (A (BOD removal)) *Lactate(C3H5O3-)* !Oxygen! ^Ammonium^ (B (denitrification)) *Acetate(CH3COO-)* !Nitrate! ^Ammonium^ (C (methanogenesis; autotroph)) *H2* !Carbon dioxide! ^Ammonium^