Answered: Pacemakers are electronic devices that…

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter17: Electrochemistry And Its Applications

Section17.6: E⁰cell, Gibbs Free Energy, And K⁰

Problem 17.6PSP

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Question

Pacemakers are electronic devices that help regulate the heart rate. Currently, lithium-iodine cells are commonly used to power pacemakers and have replaced zinc-mercury cells. Table 1 provides the operating cell potential, EE, for each cell. Table 2 provides the standard reduction potentials for several half-reactions related to zinc-mercury and zinc-air cells. Based on the information given, which of the following is a major difference between the zin mercury cell and the lithium-iodine cell? A. During the initial cell operation, each reaction is thermodynamically favorable, but the larger operating potential of the lithium-Iodine cell indicates that its cell reaction is less thermodynamically favorable B. During the initial cell operation, each reaction is thermodynamically favorable, but the larger operating potential of the lithium-iodine cell indicates that its cell reaction is more thermodynamically favorable C. During the initial cell operation, the oxidation of iodine is thermodynamically favorable but theredation of mercury is not D. During the initial cell operation, the oxidation of mercury is thermodynamically favorable but not the oxidation of iodine is not

Table 1
Cell Type
Operating Cell Potential for Commercial Batteries, E (V)
Lithium-iodine
+2.80
Zinc-mercury
+1.35
Table 2
Half-Reaction
Standard Reduction Potential, E° (V)
[Zn(OH),]? + 2 e¯ → Zn +4 OH¯
-1.20
Zn(OH)2
+ 2 e- → Zn + 2 OH
-1.25
HgO + H2O + 2 e- → Hg + 2 OH¯
+0.10
O2 + 2 H2O + 4e¯ → 4OH
+0.40

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