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Byju's Answer
Standard XII
Chemistry
Gibbs Free Energy & Spontaneity
K C for 3 /...
Question
K
C
for
3
/
2
H
2
+
1
/
2
N
2
⇌
N
H
3
are 0.0266 and
0.0129
a
t
m
−
1
respectively, at 350
o
C and 400
o
C. Calculate the heat of formation of
N
H
3
.
A
∴
△
H
=
−
50462
c
a
l
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B
∴
△
H
=
−
8133
c
a
l
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C
∴
△
H
=
12140
c
a
l
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D
∴
△
H
=
−
12140
c
a
l
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Solution
The correct option is
D
∴
△
H
=
−
12140
c
a
l
As we know,
2.303
l
o
g
[
K
P
2
K
P
1
]
=
△
H
R
[
T
2
−
T
1
T
1
T
2
]
2.303
l
o
g
[
0.0129
0.0266
]
=
△
H
2
[
673
−
623
673
×
623
]
∴
△
H
=
12140
c
a
l
=
−
12140
c
a
l
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0
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Q.
K
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Calculate the heat of formation of
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Q.
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At
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Calculate heats of formation of
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Q.
Calculate pH of
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M
N
a
H
C
O
3
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2
C
O
3
+
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2
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C
O
−
3
+
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Q.
K
c
for
3
2
H
2
+
1
2
N
2
⇌
N
H
3
are 0.0266 and 0.0129
a
t
m
−
1
respectively at
350
o
C
and
400
o
C
. Calculate heat of formation of
N
H
3
.
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