Question

A voltaic cell based on the reaction between aqueous Br2 and vanadium(III) ions
has E°cell = 0.73 V:
Br2(aq) + 2V3+(aq) + 2H2O(l) ⟶2VO2+(aq) + 4H+(aq) + 2Br−(aq)
What is E°vanadium, the standard electrode potential for the reduction of VO2+ to V3+?