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Tardigrade
Question
Chemistry
The bond energy of an O-H bond is 109 kcal/mol. When a mole of water is formed, then
Q. The bond energy of an
O
−
H
bond is
109
k
c
a
l
/
m
o
l
. When a mole of water is formed, then
2108
209
J & K CET
J & K CET 2003
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A
109 kcal is released
B
218 kcal is absorbed
C
109 kcal is absorbed
D
218 kcal is released
Solution:
Bond energy of
O
−
H
bond
=
109
k
c
a
l
/
m
o
l
∴
energy absorbed in the dissociation of
1
m
o
l
of water
(
H
2
O
)
=
2
×
109
=
218
k
c
a
l
∴
Energy released in the formation of
1
m
o
l
of water
=
218
k
c
a
l
.