14-19. (a) Write the half-reactions for a H2 -O2 fuel cell. Find the theoretical cell voltage at 25°C if P H₂ 1.0 = ar,P b 2ar, and [H] = 0.5M at both electrodes. (Real fuel cells operate at temperatures of = 02 0.2 b 60° 1000°C and produce 0.7V.) (b) If the cell is 70% efficient at converting chemical energy into electrical energy, and a stack of cells produces 20 kW at 220 V, how many grams of H2 are consumed in an hour? (c) In the U.S., engines are frequently rated in "horsepower." Use Table 1-4 to convert 20 kW to horsepower.
14-19. (a) Write the half-reactions for a H2 -O2 fuel cell. Find the theoretical cell voltage at 25°C if P H₂ 1.0 = ar,P b 2ar, and [H] = 0.5M at both electrodes. (Real fuel cells operate at temperatures of = 02 0.2 b 60° 1000°C and produce 0.7V.) (b) If the cell is 70% efficient at converting chemical energy into electrical energy, and a stack of cells produces 20 kW at 220 V, how many grams of H2 are consumed in an hour? (c) In the U.S., engines are frequently rated in "horsepower." Use Table 1-4 to convert 20 kW to horsepower.
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
Chapter18: Electrochemistry
Section: Chapter Questions
Problem 86E: An electrochemical cell consists of a silver metal electrode immersed in a solution with [Ag+] = 1.0...
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![14-19. (a) Write the half-reactions for a H2 -O2 fuel cell. Find the theoretical cell voltage at 25°C if
P
H₂
1.0
= ar,P
b
2ar, and [H] = 0.5M at both electrodes. (Real fuel cells operate at temperatures of
=
02
0.2
b
60° 1000°C and produce
0.7V.)
(b) If the cell is 70% efficient at converting chemical energy into electrical energy, and a stack of cells
produces 20 kW at 220 V, how many grams of H2 are consumed in an hour?
(c) In the U.S., engines are frequently rated in "horsepower." Use Table 1-4 to convert 20 kW to horsepower.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fea4aca71-e841-4a09-9501-c2b3ae6f23cc%2F09776230-e8b7-468a-8aa1-d29065c72794%2Fubk5bq7_processed.jpeg&w=3840&q=75)
Transcribed Image Text:14-19. (a) Write the half-reactions for a H2 -O2 fuel cell. Find the theoretical cell voltage at 25°C if
P
H₂
1.0
= ar,P
b
2ar, and [H] = 0.5M at both electrodes. (Real fuel cells operate at temperatures of
=
02
0.2
b
60° 1000°C and produce
0.7V.)
(b) If the cell is 70% efficient at converting chemical energy into electrical energy, and a stack of cells
produces 20 kW at 220 V, how many grams of H2 are consumed in an hour?
(c) In the U.S., engines are frequently rated in "horsepower." Use Table 1-4 to convert 20 kW to horsepower.
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