What is the redox reaction?

E°(cell)
= {RT/(nF)} ln(K)
= {8.314 × (273 + 25) / (2 × 96485)} × ln(72) V
= +0.055 V

ΔG°
= -RT ln(K)
= -8.314 × (273 + 25) × ln(72) J
= -1.06 × 10⁴ J