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Byju's Answer
Standard XII
Chemistry
Bond Order and Enthalpy
Calculate the...
Question
Calculate the heat of combustion of ethene
C
H
2
=
C
H
2
(
g
)
+
3
O
2
(
g
)
→
2
C
O
2
(
g
)
+
2
H
2
O
(
I
)
The bond energy data are given below
C
=
C
=
619
k
J
m
o
l
−
1
C
−
H
=
414
k
J
m
o
l
−
1
O
=
O
=
499
k
J
m
o
l
−
1
C
=
O
=
724
k
J
m
o
l
−
1
O
−
H
=
460
k
J
m
o
l
−
1
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Solution
H
e
a
t
o
f
c
o
m
b
u
s
t
i
o
n
=
Σ
[
b
o
n
d
e
n
e
r
g
y
o
f
r
e
a
c
t
a
n
t
s
]
−
Σ
[
b
o
n
d
e
n
e
r
g
y
o
f
p
r
o
d
u
c
t
s
]
Δ
H
c
=
[
(
3
×
499
)
+
619
+
(
4
×
414
)
]
−
[
(
2
×
2
×
724
)
+
(
2
×
2
×
460
)
]
k
J
m
o
l
−
1
Δ
H
c
=
[
1497
+
619
+
1656
]
−
[
2896
+
1840
]
k
J
m
o
l
−
1
Δ
H
c
=
3772
−
4736
k
J
m
o
l
−
1
Δ
H
c
=
−
964
k
J
m
o
l
−
1
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0
Similar questions
Q.
Calculate heat of combustion of ethene (figure) from bond energy data:
C
=
C
,
C
−
H
,
O
=
O
,
C
−
O
,
O
−
H
B
E
(
k
J
m
o
l
−
1
)
:
619
,
414
,
499
,
724
,
460
Q.
Using the bond enthalpy data given below, calculate the enthalpy of formation of acetone (g)
Bond energy
C
−
H
=
413.4
k
J
m
o
l
−
1
;
Bond energy
C
−
C
=
347.0
k
J
m
o
l
−
1
;
Bond energy
C
=
O
=
728.0
k
J
m
o
l
−
1
;
Bond energy
O
=
O
=
495.0
k
J
m
o
l
−
1
;
Bond energy
H
−
H
=
435.8
k
J
m
o
l
−
1
;
Δ
H
s
u
b
C
(
s
)
=
718.4
k
J
m
o
l
−
1
Q.
Calculate the enthalpy of combustion of methyl alcohol at 298 K from the following data
Bond
C
−
H
C
−
O
O
−
H
O
=
O
C
=
O
Bond Enthalpy ( kJ
m
o
l
−
1
414
351.5
464.5
494
711
Resonance energy of
C
O
2
=
−
143
k
J
m
o
l
−
1
Latent heat of vaporisation of methyl alcohol
=
35.5
k
J
m
o
l
−
1
Latent heat of vaporisation of water
=
40.6
k
J
m
o
l
−
1
Q.
Using the data (all values are in
kcal mol
−
1
at
25
o
C
) given below, calculate bond energy of
C
−
C
bond.
Δ
H
o
combustion
(ethane)
=
−
372.0
Δ
H
o
combustion
(propane)
=
−
530.0
Δ
H
o
combustion
(graphite)
→
C
(
g
)
=
−
172.0
Bond energy of
H
−
H
=
104.0
Δ
H
o
f
of
H
2
O
(
l
)
=
68.0
Δ
H
o
f
of
C
O
2
(
g
)
=
94.0
Q.
Using the data (all values are in kilo calorie per mole at
25
o
C
) given below, calculate the bond energy of
C
−
C
and
C
−
H
bonds.
Δ
H
o
c
o
m
b
u
s
t
i
o
n
o
f
e
t
h
a
n
e
=
−
372.0
Δ
H
o
c
o
m
b
u
s
t
i
o
n
o
f
p
r
o
p
a
n
e
=
−
530.0
Δ
H
for
C
g
r
a
p
h
i
t
e
→
C
(
g
)
=
+
172.0
Bond energy of
H
−
H
bond
=
+
104.0
Δ
H
f
of
H
2
O
(
l
)
=
−
68.0
Δ
H
f
of
C
O
2
(
g
)
=
−
94.0
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