Hearing Aid Batteries Utilize a Zinc/air Electrochemical Cell

question 61

Multiple Choice

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^-  Zn(s) + 2OH^-(aq)
-1) 249 V
O₂(g) + 2H₂O( ) + 4e^-  4OH^-(aq)
+0) 401 V

• A) 4
• B) 5
• C) 6
• D) 7
• E) 8

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