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Byju's Answer
Standard XII
Chemistry
System, Surroundings, Intensive, Extensive Properties
23. The entha...
Question
23. The enthalpy change (H) for the reaction, N2(g) + 3H2(g) 2NH3(g) is –92.38 kJ at 298 K. What is U at 298 K?
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Q.
The enthalpy change
(
△
H
)
for the reaction,
N
2
(
g
)
+
3
H
2
(
g
)
→
2
N
H
3
(
g
)
is -92.38kJ at 298 K. The internal energy change
△
U
at 298 K is:
Q.
The enthalpy changes
(
Δ
H
)
for the reaction,
N
2
(
g
)
+
3
H
2
(
g
)
→
2
N
H
3
(
g
)
is
−
92.38
k
J
at
298
K
. The internal energy change
Δ
U
at
298
K
is
Q.
The enthalpy change
(
Δ
H
)
for the reaction,
N
2
(
g
)
+
3
H
2
(
g
)
⟶
2
N
H
3
(
g
)
is
−
92.38
k
J
at
298
K
.
The internal energy change
Δ
U
at
298
K
is:
Q.
The reaction of cyanamide
N
H
2
C
N
(
s
)
with dioxygen was carried out in a bomb calorimeter and
△
U
was found to be
−
742.7
k
J
m
o
l
−
1
at 298 K.
N
H
2
C
N
(
g
)
+
3
2
O
2
(
g
)
→
N
2
(
g
)
+
C
O
2
(
g
)
+
H
2
O
(
l
)
Calculate enthalpy change for the reaction at 298 K?
Q.
The enthalpy change for a given reaction at
298
K
is
−
x
c
a
l
/
m
o
l
. If the reaction occurs spontaneously at
298
K
, the entropy change at that temperature:
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