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AP Chemistry
6.7 Bond Enthalpies
IntermediateMCQMathematical20.1k
The combustion of ethane gas is represented by the following equation.

\[\text{C}_2\text{H}_6(g) + \dfrac{7}{2}\text{O}_2(g) \rightarrow 2\text{CO}_2(g) + 3\text{H}_2\text{O}(g)\]

BondAverage bond enthalpy (\(\text{kJ/mol}\))
\(\text{C}-\text{C}\)\(350\)
\(\text{C}-\text{H}\)\(410\)
\(\text{O}=\text{O}\)\(500\)
\(\text{C}=\text{O}\)\(800\)
\(\text{O}-\text{H}\)\(460\)

Based on the bond enthalpy data in the table, what is the estimated standard enthalpy of combustion, \(\Delta H_{\text{comb}}^\circ\), for \(1\text{ mol}\) of \(\text{C}_2\text{H}_6(g)\)?

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