Determine E°cell for the Reaction: MnO₄^- + 8 H⁺

Determine E°cell for the reaction: MnO₄^- + 8 H⁺ + 5 Fe²⁺ → Mn²⁺ + 4 H₂O + 5 Fe³⁺. The half reactions are: Fe³⁺(aq) + e- → Fe²⁺(aq)   E° = +0.771 V
MnO₄^-(aq) + 8 H⁺(aq) + 5 e- → Mn²⁺(aq) + 4 H₂O(l)   E° = 1.507 V

A) -2.34 V
B) -2.28 V
C) 2.28 V
D) -0.74 V
E) 0.74 V