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Byju's Answer
Standard XII
Chemistry
Enthalpy
What is bond ...
Question
What is bond dissociate energy of HCl,
Δ
H
f
(
H
C
l
)
=
−
93
,
B
.
E
.
(
H
2
)
=
434
,
B
.
E
.
(
C
l
2
)
=
242
(in KJ/ mol)
A
532 KJ/mol
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B
431 KJ/mol
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C
332 KJ/mol
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D
232 KJ/mol
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Solution
The correct option is
D
431 KJ/mol
1
2
H
2
+
1
2
C
l
2
→
H
C
l
Δ
H
f
Δ
H
f
=
B
.
E
.
H
2
×
1
2
+
B
.
E
.
C
l
2
×
1
2
−
B
.
E
.
H
C
l
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0
Similar questions
Q.
Find the enthalpy of formation of Hydrogen flouride on the basis of following data :
Bond energy of
H
−
H
=
434
k
J
m
o
l
−
1
Bond energy of
F
−
F
=
158
k
J
m
o
l
−
1
Bond energy of
H
−
F
=
565
k
J
m
o
l
−
1
Q.
Bond dissociation enthalpy of
H
2
,
C
l
2
and
H
C
l
are 434, 242 and 431 kJ
m
o
l
−
1
respectively.
Enthalpy of formation of
H
C
l
is:
Q.
Bond energies of H - H and CI - CI are
430
k
J
m
o
l
−
1
and
242
k
J
m
o
l
−
1
respectively.
Δ
H
f
for HCl is
91
k
J
m
o
l
−
1
. What will be the bond energy of H - Cl bond (per mole value)?
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.
The
H
−
H
bond energy is 430 kJ mol
−
1
and
C
l
−
C
l
bond energy is 240 kJ mol
−
1
.
Δ
H
f
of
H
C
l
is
−
90
kJ. The
H
−
C
l
bond energy is
(
420
+
x
)
kJ mol
−
1
, where
x
is:
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