AP Chemistry
6.8 Enthalpy of Formation
A student is investigating the complete combustion of propane gas, \(\text{C}_3\text{H}_8(g)\). The balanced chemical equation for the combustion reaction is shown below.
\[ \text{C}_3\text{H}_8(g) + 5\,\text{O}_2(g) \rightarrow 3\,\text{CO}_2(g) + 4\,\text{H}_2\text{O}(l) \]
Standard enthalpies of formation, \(\Delta H_f^\circ\), measured at \(298\text{ K}\) are provided in the table below.
Based on the data in the table, what is the standard enthalpy of combustion, \(\Delta H_{\text{rxn}}^\circ\), for the reaction?
\[ \text{C}_3\text{H}_8(g) + 5\,\text{O}_2(g) \rightarrow 3\,\text{CO}_2(g) + 4\,\text{H}_2\text{O}(l) \]
Standard enthalpies of formation, \(\Delta H_f^\circ\), measured at \(298\text{ K}\) are provided in the table below.
| Substance | \(\Delta H_f^\circ\text{ (kJ/mol)}\) |
|---|---|
| \(\text{C}_3\text{H}_8(g)\) | \(-104\) |
| \(\text{O}_2(g)\) | \(0\) |
| \(\text{CO}_2(g)\) | \(-394\) |
| \(\text{H}_2\text{O}(l)\) | \(-286\) |
Based on the data in the table, what is the standard enthalpy of combustion, \(\Delta H_{\text{rxn}}^\circ\), for the reaction?
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