Pacemakers Implanted in the Chests of Patients with Certain Heart $\rarr$

question 35

Multiple Choice

Pacemakers implanted in the chests of patients with certain heart conditions are powered by a lithium/iodine PVP battery, where PVP represents polyvinylpyridine. The cell reaction and standard cell potential are given below. The standard reduction potential for Li/Li+ is -3.05 V. What species is oxidized in this reaction?
2Li(s) + I₂:PVP(s) $\rarr$ 2LiI(s) + PVP(s)
3.59 V

• A) Li
• B) I₂
• C) I₂:PVP
• D) PVP
• E) LiI

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