Some bacteria can use nitrate as an electron acceptor instead of oxygen, reducing it to nitrite. this requires an enzyme called nitrate reductase. write a balanced equation for the oxidation of nadh by nitrate 5 points] calculate the gibbs free energy change under standard state conditions (ago) for the oxidation of nadh by nitrate [tip: you will need to look at table 3.5 in the textbook]. the faraday constant, f, is 96.5 kj/vmol.