(a) Write the half-reactions at the zinc-air electrodes and calculate the standard emf of the battery at 25°C. (b) Calculate the emf under actual operating conditions when the partial pressure of oxygen is 0.21 bar. (c) What is the energy density (measured as the energy in kilojoules that can be obtained from 1 kg of the metal) of the zinc electrode? (d) If a current of 2.1 X 10 A is to be drawn from a zinc-air battery system, what volume of air (in liters) would need to be supplied to the battery every second? Assume that the temperature is 25°C and the partial pressure of oxygen is 0.21 bar.

(a) Write the half-reactions at the zinc-air electrodes and calculate the standard emf of the battery at 25°C. (b) Calculate the emf under actual operating conditions when the partial pressure of oxygen is 0.21 bar. (c) What is the energy density (measured as the energy in kilojoules that can be obtained from 1 kg of the metal) of the zinc electrode? (d) If a current of 2.1 X 10 A is to be drawn from a zinc-air battery system, what volume of air (in liters) would need to be supplied to the battery every second? Assume that the temperature is 25°C and the partial pressure of oxygen is 0.21 bar.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

13.107 The zinc-air battery shows much promise for
electric cars because it is lightweight and
rechargeable:
Air (O2)
Air cathode
20H
H,0
Zn(OI1)2 ZnO
Zinc anode
Zn
The net transformation is
Zn(s) + 02(g)
» ZnO(s)
(a) Write the half-reactions at the zinc-air electrodes
and calculate the standard emf of the battery at
25°C. (b) Calculate the emf under actual operating
conditions when the partial pressure of oxygen is
0.21 bar. (c) What is the energy density (measured
as the energy in kilojoules that can be obtained from
1 kg of the metal) of the zinc electrode? (d) If a
current of 2.1 X 10 A is to be drawn from a zinc-air
battery system, what volume of air (in liters) would
need to be supplied to the battery every second?
Assume that the temperature is 25°C and the partial
pressure of oxygen is 0.21 bar.

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