14 - 19. (a) Write the half- reactions for a H₂ - O₂ fuel cell. 2 2 Find the theoretical cell voltage at 25°C if P 1.0 ar P H₂ b 02 0.2 = b ar, and [H] = 0.5M at both electrodes. (Real fuel cells operate at temperatures of 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 H are consumed in an hour? 2 (c) In the U.S., engines are frequently rated in "horsepower." Use Table 1-4 to convert 20 kW to horsepower. Answer (a) 1.219 V (b) 4.88 h (c) 26.8 horsepower 20. (a) 1.219 V (b) 4.88 g/h (c) 26.8 horsepower
14 - 19. (a) Write the half- reactions for a H₂ - O₂ fuel cell. 2 2 Find the theoretical cell voltage at 25°C if P 1.0 ar P H₂ b 02 0.2 = b ar, and [H] = 0.5M at both electrodes. (Real fuel cells operate at temperatures of 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 H are consumed in an hour? 2 (c) In the U.S., engines are frequently rated in "horsepower." Use Table 1-4 to convert 20 kW to horsepower. Answer (a) 1.219 V (b) 4.88 h (c) 26.8 horsepower 20. (a) 1.219 V (b) 4.88 g/h (c) 26.8 horsepower
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter17: Electrochemistry
Section: Chapter Questions
Problem 59P
Related questions
Question
Please correct answer and don't use hand rating
![14 - 19. (a) Write the half- reactions for a H₂ - O₂ fuel cell.
2
2
Find the theoretical cell voltage at 25°C if
P
1.0 ar P
H₂ b 02
0.2
=
b
ar, and [H] = 0.5M at both
electrodes. (Real fuel cells operate at temperatures of
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 H are consumed in an hour?
2
(c) In the U.S., engines are frequently rated in "horsepower."
Use Table 1-4 to convert 20 kW to horsepower.
Answer
(a) 1.219 V
(b) 4.88
h
(c) 26.8 horsepower
20. (a) 1.219 V
(b) 4.88 g/h (c) 26.8 horsepower](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6af99e31-d807-4d63-ba6c-dec76a1a610e%2F00325a24-c5a8-4b7e-9358-3d2ad8b4668a%2Fjppyz09_processed.jpeg&w=3840&q=75)
Transcribed Image Text:14 - 19. (a) Write the half- reactions for a H₂ - O₂ fuel cell.
2
2
Find the theoretical cell voltage at 25°C if
P
1.0 ar P
H₂ b 02
0.2
=
b
ar, and [H] = 0.5M at both
electrodes. (Real fuel cells operate at temperatures of
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 H are consumed in an hour?
2
(c) In the U.S., engines are frequently rated in "horsepower."
Use Table 1-4 to convert 20 kW to horsepower.
Answer
(a) 1.219 V
(b) 4.88
h
(c) 26.8 horsepower
20. (a) 1.219 V
(b) 4.88 g/h (c) 26.8 horsepower
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