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Reaction 1: has
CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics
Problem
Reaction 1:
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
)
has
Δ
H
1
=
−
111
kJ
\Delta H_1 = -111\,\text{kJ}
Δ
H
1
=
−
111
kJ
. Reaction 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
)
has
Δ
H
2
=
−
283
kJ
\Delta H_2 = -283\,\text{kJ}
Δ
H
2
=
−
283
kJ
. Determine the enthalpy change, in kJ, for the overall reaction
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
)
.
Related theory
Hess's Law
Thermodynamics
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