Batteries and Fuel Cells (Section)Heart pacemakers are
Chapter 9, Problem 77E(choose chapter or problem)
Problem 77E
Batteries and Fuel Cells (Section)
Heart pacemakers are often powered by lithium–silver chromate “button” batteries. The overall cell reaction is
2 Li(s) + Ag2CrO4(s)→ Li2CrO4(s) + 2 Ag(s)
(a) Lithium metal is the reactant at one of the electrodes of the battery. Is it the anode or the cathode? (b) Choose the two half-reactions from Appendix E that most closely approximate the reactions that occur in the battery. What standard emf would be generated by a voltaic cell based on these halfreactions? (c) The battery generates an emf of +3.5 V. How close is this value to the one calculated in part (b)? (d) Calculate the emf that would be generated at body temperature, 37 °C. How does this compare to the emf you calculated in part (b)?
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