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Chemistry
Chemistry
Problem
Consider the following thermochemical equations at
25
∘
C
25\,^\circ\!\text{C}
25
∘
C
: (1)
C
(
s
)
+
O
2
(
g
)
→
CO
2
(
g
)
\text{C}(s) + \text{O}_2(g) \rightarrow \text{CO}_2(g)
C
(
s
)
+
O
2
(
g
)
→
CO
2
(
g
)
Δ
H
1
=
−
394
kJ
\Delta H_1 = -394\,\text{kJ}
Δ
H
1
=
−
394
kJ
(2)
CO
(
g
)
+
1
2
O
2
(
g
)
→
CO
2
(
g
)
\text{CO}(g) + \tfrac{1}{2}\,\text{O}_2(g) \rightarrow \text{CO}_2(g)
CO
(
g
)
+
2
1
O
2
(
g
)
→
CO
2
(
g
)
Δ
H
2
=
−
283
kJ
\Delta H_2 = -283\,\text{kJ}
Δ
H
2
=
−
283
kJ
What is the enthalpy change,
Δ
H
\Delta H
Δ
H
, for the reaction
C
(
s
)
+
1
2
O
2
(
g
)
→
CO
(
g
)
\text{C}(s) + \tfrac{1}{2}\,\text{O}_2(g) \rightarrow \text{CO}(g)
C
(
s
)
+
2
1
O
2
(
g
)
→
CO
(
g
)
? a)
+
111
kJ
+111\,\text{kJ}
+
111
kJ
b)
−
252.5
kJ
-252.5\,\text{kJ}
−
252.5
kJ
c)
−
111
kJ
-111\,\text{kJ}
−
111
kJ
d)
−
677
kJ
-677\,\text{kJ}
−
677
kJ
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