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Standard VI
Chemistry
Compounds
ntStandard fr...
Question
ntStandard free energies of formation at 298K are-237.2 ,394.4 and -8.2 for H20(l) ,CO2(g) and pentane (g) .The value of E^° cell for pentane oxygen is?n
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Q.
Standard free energies of formation (in kJ/mol) at 298 K are -237.2, -394.4 and -8.2 for
H
2
O
(
l
)
,
C
O
2
(
g
)
and pentane (g), respectively. The value of
E
0
c
e
l
l
for the pentane-oxygen fuel cell is:
Q.
Standard free energies of formation(in
k
J
/
m
o
l
) at
298
K are
−
237.2
,
−
394.4
and
−
8.2
for
H
2
O
(
I
)
,
C
O
2
(
g
)
and pentane(g) respectively. The value of
E
o
c
e
l
l
for the pentane-oxygen fuel cell is:
Q.
The standard free energies of formation of
H
2
O
(
l
)
,
C
O
2
(
g
)
an n-pentane are
−
237.2
k
J
,
−
394.4
k
J
,
−
8.2
k
J
. Then the value of
E
0
for pentane-oxygen fuel cell is:
Q.
If a fuel cell, methanol is used as fuel and oxygen gas is used as an oxidiser. The reaction is
C
H
3
O
H
(
l
)
+
3
2
O
2
(
g
)
→
C
O
2
(
g
)
+
2
H
2
O
(
g
)
At
298
K
standard Gibb’s energies of formation for
C
H
3
O
H
(
l
)
,
H
2
O
(
l
)
,
and
C
O
2
(
g
)
are
–
166.2
,
–
237.2
and
−
394.4
kJ mol
−
1
,
respectively. If the standard enthalpy of combustion of methanol is
–
726
kJ mol
−
1
, the efficiency of the fuel cell will be:
Q.
In a fuel cell, methanol is used as fuel and oxygen gas is used as an oxidizer.
The reaction is:
C
H
3
O
H
(
l
)
+
3
2
O
2
(
g
)
→
C
O
2
(
g
)
+
2
H
2
O
(
l
)
At
298
K
, standard Gibb's energies of formation for
C
H
3
O
H
(
l
)
,
H
2
O
(
l
)
and
C
O
2
(
g
)
are
−
166.2
,
−
237.2
and
−
394.4
k
J
m
o
1
−
1
respectively.
If standard enthalpy of combustion of methanol is
−
726
k
J
m
o
1
−
1
, efficiency of the fuel cell will be:
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