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Tardigrade
Question
Chemistry
H2(g)+(1/2)O2(g) arrow H2O(l) ; Bond energy of H-H=x1;(Δ )aH(O2 , g)=x2 and Bond energy of O-H=x3 . The latent heat of vaporisation of liquid water into water vapour =x4 , then heat of formation of liquid water is
Q.
H
2
(
g
)
+
2
1
O
2
(
g
)
→
H
2
O
(
l
)
; Bond energy of
H
−
H
=
x
1
;
(
Δ
)
a
H
(
O
2
,
g
)
=
x
2
and Bond energy of
O
−
H
=
x
3
. The latent heat of vaporisation of liquid water into water vapour
=
x
4
, then heat of formation of liquid water is
1101
154
NTA Abhyas
NTA Abhyas 2020
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A
x
1
+
2
x
2
−
x
3
+
x
4
B
2
x
3
−
x
1
−
2
x
2
+
x
4
C
x
1
+
2
x
2
−
2
x
3
−
x
4
D
x
1
+
2
x
2
−
2
x
3
+
x
4
Solution:
H
2
(
g
)
+
2
1
O
2
(
g
)
→
H
2
O
(
l
)
(
Δ
)
r
H
=
[
(
BE
)
(
H
−
H
)
+
2
1
(
BE
)
(
O
−
O
)
]
−
[
2
(
BE
)
(
O
−
H
)
]
=
x
1
+
2
x
2
−
2
x
3
∵
H
2
O
(
l
)
→
H
2
O
(
g
)
Δ
H
=
x
4
⇒
H
2
O
(
g
)
→
H
2
O
(
l
)
Δ
H
=
−
x
4
so final,
Δ
r
H
=
x
1
+
2
x
2
−
2
x
3
−
x
4