Calculate the biological standard gibbs energies of

Question

Calculate the biological standard Gibbs energies of reactions of the following reactions and half-reactions:

(a) 2 NADH(aq) + O2(g) + 2 H+(aq) ? 2 NAD+(aq) + 2 H2O(l) E? = + 1.4 V

(b) Malate2-(aq) + NAD+(aq) ? oxaloacetate2-(aq) + NADH(aq) + H+(aq)
E? = 0.154 V

(c) O2(g) + 4 H+(aq) + 4 e- ? 2 H2O(l) E? = 0.81 V