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Compute for the combustion reaction using the average bond energies below (all in ):…
CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics
Problem
Compute
Δ
H
\Delta H
Δ
H
for the combustion reaction
2
C
2
H
6
(
g
)
+
7
O
2
(
g
)
→
4
C
O
2
(
g
)
+
6
H
2
O
(
g
)
\mathrm{2\,C_2H_6(g) + 7\,O_2(g) \rightarrow 4\,CO_2(g) + 6\,H_2O(g)}
2
C
2
H
6
(
g
)
+
7
O
2
(
g
)
→
4
C
O
2
(
g
)
+
6
H
2
O
(
g
)
using the average bond energies below (all in
kJ mol
−
1
\text{kJ mol}^{-1}
kJ mol
−
1
): C–C: 348 C–H: 413 O=O: 498 C=O (in CO
2
_2
2
): 799 O–H: 463 Report the enthalpy change in
kJ
\text{kJ}
kJ
for the reaction as written.
Related theory
Thermodynamics
Enthalpy Changes of Reactions
Bond Enthalpies
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