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Chemistry
Chemistry
Problem
Assume each reaction is carried out in an open container. For which reaction will
Δ
H
=
Δ
U
\Delta H = \Delta U
Δ
H
=
Δ
U
? (1)
H
2
(
g
)
+
B
r
2
(
g
)
→
2
H
B
r
(
g
)
H_2(g) + Br_2(g) \rightarrow 2 HBr(g)
H
2
(
g
)
+
B
r
2
(
g
)
→
2
H
B
r
(
g
)
(2)
C
(
s
)
+
2
H
2
O
(
g
)
→
2
H
2
(
g
)
+
C
O
2
(
g
)
C(s) + 2 H_2O(g) \rightarrow 2 H_2(g) + CO_2(g)
C
(
s
)
+
2
H
2
O
(
g
)
→
2
H
2
(
g
)
+
C
O
2
(
g
)
(3)
P
C
l
5
(
g
)
→
P
C
l
3
(
g
)
+
C
l
2
(
g
)
PCl_5(g) \rightarrow PCl_3(g) + Cl_2(g)
P
C
l
5
(
g
)
→
P
C
l
3
(
g
)
+
C
l
2
(
g
)
(4)
2
C
O
(
g
)
+
O
2
(
g
)
→
2
C
O
2
(
g
)
2 CO(g) + O_2(g) \rightarrow 2 CO_2(g)
2
C
O
(
g
)
+
O
2
(
g
)
→
2
C
O
2
(
g
)
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