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Standard XII
Chemistry
Nomenclature of Unsaturated Hydrocarbons
50. How to co...
Question
50. How to compare the bond energy of the homonuclearcovalent bond and the heteronuclear bond like bond energy of O-H bond and H-H bond in H2O
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Q.
H
2
(
g
)
+
1
2
O
2
(
g
)
⟶
H
2
O
(
g
)
Δ
H
=
−
242
k
J
m
o
l
−
1
Bond energy of
H
2
and
O
2
are
436
and
500
k
J
mol
−
1
respectively. The bond energy of O
−
H bond is :
Q.
For,
H
2
O
the bond angle is
104.5
∘
and for
H
2
S
the bond angle is
92.1
∘
.
Difference in bond angle is due to :
Q.
Δ
H
f
of
C
2
H
4
=
12.5
k
c
a
l
Heat of atomisation of
C
=
171
k
c
a
l
. Bond energy of
H
2
=
104.3
k
c
a
l
. Bond energy
C
−
H
=
99.3
k
c
a
l
. What is
C
=
C
bond energy?
Q.
Calculate the enthalpy change for the reaction,
H
2
+
F
2
→
2
H
F
given that
Bond energy of H – H bond = 434 kJ/mol
Bond energy of F – F bond = 158 kJ/mol
Bond energy of H – F bond = 565 kJ/mol
Q.
Bond angle in
H
2
O
(104.5
∘
) is higher than the bond angle of
H
2
S
(92.1
∘
). The difference is due to:
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