Hearing Aid Batteries Utilize a Zinc/air Electrochemical Cell $\rarr$ Zn(s) + 2OH^-(aq)
-1)249 V
O₂(g) + 2H₂O(l) + 4e^-

Hearing aid batteries utilize a zinc/air electrochemical cell. The reduction half-reactions and standard reduction potentials for this cell are given below. Write the balanced reaction equation for the cell and report the sum of the stoichiometric coefficients.
Zn(OH) ₂(s) + 2e^- $\rarr$ Zn(s) + 2OH^-(aq)
-1) 249 V
O₂(g) + 2H₂O(l) + 4e^- $\rarr$ 4OH^-(aq)
+0.401 V

A) 4
B) 5
C) 6
D) 7
E) 8