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Chemistry
Chemistry
Problem
Acetylene combusts according to
C
2
H
2
(
g
)
+
5
2
O
2
(
g
)
→
2
CO
2
(
g
)
+
H
2
O
(
l
)
\text{C}_2\text{H}_2(g)+\tfrac{5}{2}\,\text{O}_2(g)\rightarrow 2\,\text{CO}_2(g)+\text{H}_2\text{O}(l)
C
2
H
2
(
g
)
+
2
5
O
2
(
g
)
→
2
CO
2
(
g
)
+
H
2
O
(
l
)
with
Δ
H
=
−
1299
kJ
\Delta H=-1299\,\text{kJ}
Δ
H
=
−
1299
kJ
per reaction as written. If
3.50
g
3.50\,\text{g}
3.50
g
of
C
2
H
2
\text{C}_2\text{H}_2
C
2
H
2
is burned in the presence of
3.50
g
3.50\,\text{g}
3.50
g
of
O
2
\text{O}_2
O
2
, what is the approximate heat released? a)
+
57
kJ
+57\,\text{kJ}
+
57
kJ
b)
−
57
kJ
-57\,\text{kJ}
−
57
kJ
c)
−
28
kJ
-28\,\text{kJ}
−
28
kJ
d)
−
175
kJ
-175\,\text{kJ}
−
175
kJ
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