AP Chemistry
6.7 Bond Enthalpies
A landfill-gas facility burns methane to generate thermal energy. The combustion reaction, with water produced as a gas, is represented by the equation
\(\text{CH}_4\text{(g)}+2\text{O}_2\text{(g)}\rightarrow\text{CO}_2\text{(g)}+2\text{H}_2\text{O(g)}\)
Based on the data, what is the estimated enthalpy change for the combustion of \(1\text{ mol}\) of \(\text{CH}_4\text{(g)}\)?
\(\text{CH}_4\text{(g)}+2\text{O}_2\text{(g)}\rightarrow\text{CO}_2\text{(g)}+2\text{H}_2\text{O(g)}\)
| Bond | Average bond dissociation energy (\(\text{kJ/mol}\)) |
|---|---|
| \(\text{C-H}\) | 413 |
| \(\text{O}=\text{O}\) | 498 |
| \(\text{C}=\text{O}\) in \(\text{CO}_2\) | 799 |
| \(\text{O-H}\) | 463 |
Based on the data, what is the estimated enthalpy change for the combustion of \(1\text{ mol}\) of \(\text{CH}_4\text{(g)}\)?
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