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AP Chemistry
6.8 Enthalpy of Formation
IntermediateMCQMathematical12.9k
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.

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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