Methane is produced by Archaea growing on either hydrogen (H2) or acetate (CH3COOH) as electron donors. a. Neglecting cell growth, which is very small, write a balanced molar stoichiometry for methane production from each substrate, assuming CO2 is the electron acceptor, given. Electron acceptor half-reaction is: 0.125CO2 + H+ + e + 0.125CH4 + 0.5H2O Electron donor half-reaction for acetate is: 0.125CH3COO + 0.375H20 0.125CO2 + 0.125HCO3 + H+ + e Electron donor half-reaction for hydrogen is: 0.5H2 H+ + e b. On a mass basis (g-methane produced/g-electron donor consumed), which electron donor is more efficient? C. Compare donor efficiency on a COD basis (g-methane-COD/g-electron donor-COD), given: Compound H2 CH3COO CH4 COD-i/g-i 8.0 1.085 4.0 d. Why might the cell yield for Archaea be lower if hydrogen is the substrate