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Advanced Thermodynamics for Engineers, 2nd Edition
book

Advanced Thermodynamics for Engineers, 2nd Edition

by Ali Turan, D. Winterbone
February 2015
Intermediate to advanced content levelIntermediate to advanced
578 pages
19h 27m
English
Butterworth-Heinemann
Content preview from Advanced Thermodynamics for Engineers, 2nd Edition
Now, from the Van’t Hoff equation
d
dT
ðln K
p
r
Þ¼
Q
p
<T
2
(21.44)
Substituting from Eqn (21.44) into Eqn (21.43) gives
vE
vT
p
¼
<T
z
i
F
Q
p
<T
2
þ
E
T
¼
Q
p
z
i
FT
þ
E
T
(21.45)
Equation (21.45) shows that the change of emf is related to the heat of reaction, Q
p
.Now,for
exothermic reactions Q
p
is negative, and this means that the emf of a cell based on an exothermic
reaction decreases with temperature. This is in line with the effect of temperature on the degree of
dissociation in a combustion process, as discussed in Chapter 12.
21.2.4.1 Examples
Example 1
A Pb–Hg fuel cell operates according to the following equation
Pb þ Hg
2
Cl
2
/PbCl
2
þ 2Hg
and the heat of reaction, Q
p
¼95,200
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Publisher Resources

ISBN: 9780444633736