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Standard XII
Chemistry
Thermal Decomposition of Alkanes
21. Calculate...
Question
21. Calculate the standard enthalpy of formation of n-butane, given that the standard enthalpies of combustion of n-butane, C(graphite) and H2(g) are –2878.5 kJ mol–1, –393.5 kJ mol–1 and –285.8 kJ mol–1 respectively.
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Q.
The enthalpy of combustion of one mole of benzene, carbon and hydrogen are
−
3267
k
J
/
m
o
l
,
−
393.5
k
J
/
m
o
l
and
−
285.8
k
J
/
m
o
l
respectively. Calculate the standard enthalpy of formation of benzene.
Q.
The standard enthalpies of combustion of
C
6
H
6
(
l
)
,
C
(
g
r
a
p
h
i
t
e
)
and
H
2
(
g
)
are respectively
−
3270
k
J
m
o
l
−
1
,
−
394
k
J
m
o
l
−
1
and
−
286
k
J
m
o
l
−
1
. What is the standard enthalpy of formation of
C
6
H
6
(
l
)
in
k
J
m
o
l
−
1
?
Q.
The standard enthalpy of formation of octane
(
C
8
H
18
)
is
−
250
k
J
/
m
o
l
. Calculate the enthalpy of combustion of
C
8
H
18
.
Given : enthalpy of formation of
C
O
2
(
g
)
and
H
2
O
(
l
)
are
−
394
k
J
/
m
o
l
and
−
286
k
J
/
m
o
l
respectively:
Q.
The combustion enthalpies of carbon, hydrogen and ethyne are
−
393.5
k
J
m
o
l
−
1
,
−
285.8
k
J
m
o
l
−
1
and
−
1309.5
k
J
m
o
l
−
1
respectively at
25
o
C
.
The value of standard enthalpy of formation of acetylene at this temperature is:
Q.
The enthalpy of combustion of methane, graphite and dihydrogen at
298
K
are
−
890.3
k
J
m
o
l
−
1
,
−
393.5
k
J
m
o
l
−
1
,
−
285.8
k
J
m
o
l
−
1
respectively. Enthalpy of formation of
C
H
4
(
g
)
will be:
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