1
You visited us
1
times! Enjoying our articles?
Unlock Full Access!
Byju's Answer
Standard XII
Chemistry
Bond Order and Enthalpy
Calculate Δ...
Question
Calculate
Δ
H
o
of the reaction
2
N
a
B
r
+
C
l
2
=
2
N
a
C
l
+
B
r
2
, if there is known the
Δ
H
o
of substances formation:
Δ
H
o
(
N
a
B
r
)
=
−
361
K
J
/
m
o
l
Δ
H
o
(
N
a
C
l
)
=
−
411
K
J
/
m
o
l
Open in App
Solution
2
N
a
B
r
+
C
l
2
⟶
2
N
a
C
l
+
B
r
2
;
△
r
H
∘
△
r
H
∘
=
∑
△
H
∘
(
p
r
o
d
u
c
t
s
)
−
∑
△
H
∘
(
r
e
a
c
t
a
n
t
s
)
=
2
△
H
∘
(
N
a
B
r
)
+
△
H
∘
(
C
l
2
)
−
2
△
H
∘
(
N
a
C
l
)
−
△
H
∘
(
B
r
)
=
2
×
(
−
361
)
+
0
−
2
×
(
−
411
)
−
0
=
100
K
J
/
m
o
l
Therefore the
△
H
∘
of reaction is
100
K
J
/
m
o
l
.
Suggest Corrections
0
Similar questions
Q.
From the data at
25
o
C
:
F
e
2
O
3
(
s
)
+
3
C
g
r
a
p
h
i
t
e
⟶
2
F
e
(
s
)
+
3
C
O
(
g
)
;
Δ
H
o
=
492
k
J
/
m
o
l
F
e
O
(
s
)
+
C
g
r
a
p
h
i
t
e
⟶
F
e
(
s
)
+
C
O
(
g
)
;
Δ
H
o
=
155.8
k
J
/
m
o
l
C
g
r
a
p
h
i
t
e
+
O
2
(
g
)
⟶
C
O
2
(
g
)
;
Δ
H
o
=
−
393.51
k
J
/
m
o
l
C
O
(
g
)
+
1
2
O
2
(
g
)
⟶
C
O
2
(
g
)
;
Δ
H
o
=
−
282.98
k
J
/
m
o
l
Calculate standard heats of formation of
F
e
O
(
s
)
and
F
e
2
O
3
(
s
)
.
Q.
Calculate
Δ
H
o
for the reaction,
N
a
2
O
(
s
)
+
S
O
3
(
g
)
→
N
a
2
S
O
4
(
g
)
using the following :
N
a
(
s
)
+
H
2
O
(
l
)
→
N
a
O
H
(
s
)
+
1
2
H
2
(
g
)
;
Δ
H
o
=
−
146
k
J
N
a
2
S
O
4
(
s
)
+
H
2
O
(
l
)
→
2
N
a
O
H
(
s
)
+
S
O
3
(
g
)
;
Δ
H
o
=
+
418
k
J
2
N
a
O
(
s
)
+
2
H
2
(
g
)
→
4
N
a
(
s
)
+
2
H
2
O
(
l
)
;
Δ
H
o
=
+
259
k
J
Q.
If,
H
2
(
g
)
+
C
l
2
(
g
)
→
2
H
C
l
(
g
)
;
Δ
H
o
=
−
44
K
c
a
l
2
N
a
(
s
)
+
2
H
C
l
(
g
)
→
2
N
a
C
l
(
s
)
+
H
2
(
g
)
;
Δ
H
=
−
152
K
c
a
l
Then,
N
a
(
s
)
+
0.5
C
l
2
(
g
)
→
N
a
C
l
(
s
)
;
Δ
H
o
=
?
Q.
Calculate the standard enthalpy of formation of
C
H
3
O
H
(
l
)
from the following data.
C
H
3
O
H
(
l
)
+
3
2
O
2
(
g
)
→
C
O
2
(
g
)
+
2
H
2
O
(
l
)
;
Δ
H
o
=
−
726
kJ
m
o
l
−
1
C(graphite)
+
O
2
(
g
)
→
C
O
2
(
g
)
;
Δ
c
H
0
=
−
393
kJ
m
o
l
−
1
H
2
(
g
)
+
1
2
O
2
(
g
)
→
H
2
O
(
l
)
;
Δ
t
H
o
=
−
286
kJ
m
o
l
−
1
.
Q.
Δ
U
o
of combustion of methane is
−
X
k
J
m
o
l
−
1
. The value of
Δ
H
o
is:
View More
Join BYJU'S Learning Program
Grade/Exam
1st Grade
2nd Grade
3rd Grade
4th Grade
5th Grade
6th grade
7th grade
8th Grade
9th Grade
10th Grade
11th Grade
12th Grade
Submit
Related Videos
Bond Parameters
CHEMISTRY
Watch in App
Explore more
Bond Order and Enthalpy
Standard XII Chemistry
Join BYJU'S Learning Program
Grade/Exam
1st Grade
2nd Grade
3rd Grade
4th Grade
5th Grade
6th grade
7th grade
8th Grade
9th Grade
10th Grade
11th Grade
12th Grade
Submit
AI Tutor
Textbooks
Question Papers
Install app