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Byju's Answer
Standard XII
Chemistry
Heat of Formation
Calculate H...
Question
Calculate
△
H
∘
f
for chloride ion from the following data :
1
2
H
2
(
g
)
+
1
2
C
l
2
(
g
)
→
H
C
l
(
g
)
;
△
H
∘
f
=
−
92.4
k
J
H
C
l
(
g
)
+
n
H
2
O
→
H
+
(
a
q
)
+
C
l
−
(
a
q
)
;
△
H
∘
=
−
74.8
k
J
△
H
∘
f
H
+
(
a
q
)
=
0.0
k
J
.
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Solution
H
C
I
(
g
)
+
n
H
2
O
→
H
+
(
a
q
)
+
C
l
−
(
a
q
)
;
Δ
H
=
−
74.8
K
J
Δ
H
=
Δ
H
f
C
l
−
−
Δ
H
f
H
C
I
Δ
H
f
C
l
−
=
Δ
H
+
Δ
H
f
H
C
I
⇒
−
74.8
−
92.4
K
J
Δ
H
f
C
l
−
=
−
177.2
K
J
Hence, this is the answer.
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Similar questions
Q.
Calculate
Δ
H
o
f
for chloride ion from the following data:
1
2
H
2
(
g
)
+
1
2
C
l
2
(
g
)
→
H
C
l
(
g
)
Δ
H
=
−
92.4
KJ
H
C
l
(
g
)
+
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H
2
O
(excess)
→
H
+
(
a
q
)
+
C
l
−
(
a
q
)
Δ
H
=
−
74.8
KJ
Δ
H
o
f
(
H
+
(
a
q
)
)
=
0.0
KJ.
Q.
Calculate
Δ
H
o
f
for chloride ion from the following data:
1
2
H
2
(
g
)
+
1
2
C
l
2
(
g
⟶
H
C
l
(
g
)
;
Δ
H
=
−
92.4
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J
m
o
l
−
1
H
C
l
(
g
)
+
n
H
2
O
⟶
H
+
(
a
q
.
)
+
C
l
−
(
a
q
.
)
;
Δ
H
=
−
74.8
k
J
m
o
l
−
1
Δ
H
o
f
(
H
+
(
a
q
.
)
=
0.0
k
J
m
o
l
−
1
Q.
Calculate
Δ
f
H
o
in kJ
(magnitude only) for chloride ion (in aq.) from the following data:
1
2
H
2
(
g
)
+
1
2
C
l
2
(
g
)
→
H
C
l
(
g
)
;
Δ
f
H
o
=
−
92.4
kJ
H
C
l
(
g
)
+
H
2
O
(
l
)
→
H
3
O
+
+
(
a
q
)
+
C
l
−
(
a
q
)
;
Δ
H
o
=
−
74.8
kJ
Δ
f
H
o
of
H
+
(
a
q
)
=
0.0
kJ
Q.
Calculate the heat of formation of anhydrous
A
l
2
C
l
2
from
2
A
l
(
s
)
+
6
H
C
l
(
a
q
)
→
A
l
2
C
l
6
(
a
q
)
+
3
H
2
(
g
)
,
△
H
=
−
239.76
k
c
a
l
H
2
(
g
)
+
C
l
2
(
g
)
→
2
H
C
l
(
g
)
,
△
H
=
−
44.0
k
c
a
l
H
C
l
(
g
)
+
A
q
→
H
C
l
(
a
q
)
,
△
H
=
−
17.32
k
c
a
l
A
l
2
C
l
6
(
s
)
+
A
q
→
A
l
2
C
l
6
(
a
q
)
,
△
H
=
−
153.69
k
c
a
l
.
Q.
Calculate the heat of formation of
K
O
H
from the following data in K.Cal
K
(
s
)
+
H
2
O
+
a
q
→
K
O
H
(
a
q
)
+
1
2
H
2
;
Δ
H
=
−
48.4
K
.
C
a
l
H
2
(
g
)
+
1
2
O
2
(
g
)
→
H
2
O
(
l
)
;
Δ
H
=
−
68.44
K
.
C
a
l
K
O
H
(
s
)
+
a
q
→
K
O
H
(
a
q
)
;
Δ
H
=
−
14.0
K
.
C
a
l
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