AP Chemistry
6.8 Enthalpy of Formation
A student investigates the reduction of iron(III) oxide by carbon monoxide gas, as represented by the following balanced chemical equation:
\(\text{Fe}_2\text{O}_3\text{(s)} + 3\,\text{CO(g)} \rightarrow 2\,\text{Fe(s)} + 3\,\text{CO}_2\text{(g)}\)
The student collects the thermodynamic data shown in the table below.
Based on the data in the table, what is the standard enthalpy change, \(\Delta H^\circ_{rxn}\), for the reaction?
\(\text{Fe}_2\text{O}_3\text{(s)} + 3\,\text{CO(g)} \rightarrow 2\,\text{Fe(s)} + 3\,\text{CO}_2\text{(g)}\)
The student collects the thermodynamic data shown in the table below.
| Substance | \(\Delta H^\circ_f\text{ (kJ/mol)}\) |
|---|---|
| \(\text{Fe}_2\text{O}_3\text{(s)}\) | \(-824\) |
| \(\text{CO(g)}\) | \(-110\) |
| \(\text{Fe(s)}\) | \(0\) |
| \(\text{CO}_2\text{(g)}\) | \(-394\) |
Based on the data in the table, what is the standard enthalpy change, \(\Delta H^\circ_{rxn}\), for the reaction?
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