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Fuel Cells
book

Fuel Cells

by Shripad T. Revankar, Pradip Majumdar
May 2014
Beginner to intermediate content levelBeginner to intermediate
748 pages
23h 13m
English
CRC Press
Content preview from Fuel Cells
118 Fuel Cells
Let us consider two separate cases: (i) water existing in liquid form and
(ii)water existing in vapor form.
i. Water in liquid form
The enthalpy of formation is given as
∆∆
∆∆
hh hhhhh
ff
HO(l)
f
H
f
O
=+
()
−+
()
−+
()
000
22
2
1
2
.
Substituting data from Table 4.2
h
f
=− −+− +(,)( )( )285 830 00
1
2
00
h
f
J/mo
l
=−285 830,
with water as liquid.
The change in absolute entropy is given as
ss
ss
fT
HO
T
H
T
O
=
()
()
()
00 0
22 2
1
2
or
s
f
J/mo
=−
=−
(. )( .) (.)
.
69 950 130 678
1
2
205 148
163 302 llK.
The Gibbs free energy of formation is given as
∆∆ ghTs
ff f
=−
=− −−
=−
285 830 298 15 163 302
285 830
,.
(.
)
,
++
=−
=−
48688 4913
237 141 51
237 141 51
.
,.
,.
J/ ...
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Publisher Resources

ISBN: 9781420089684