AP Chemistry
6.7 Bond Enthalpies
A student investigates the thermodynamics of the industrial synthesis of ammonia from its elements in the gas phase, represented by the balanced chemical equation below.
\[ \text{N}_2(g) + 3\,\text{H}_2(g) \rightarrow 2\,\text{NH}_3(g) \]
The table below provides the average bond enthalpies for the chemical bonds involved in the reaction.
Based on the information in the table, what is the estimated standard enthalpy change of the reaction, \(\Delta H^\circ_{\text{rxn}}\)?
\[ \text{N}_2(g) + 3\,\text{H}_2(g) \rightarrow 2\,\text{NH}_3(g) \]
The table below provides the average bond enthalpies for the chemical bonds involved in the reaction.
| Bond | Average bond enthalpy (\(\text{kJ/mol}\)) |
|---|---|
| \(\text{N}\equiv\text{N}\) | \(946\) |
| \(\text{H}-\text{H}\) | \(436\) |
| \(\text{N}-\text{H}\) | \(391\) |
Based on the information in the table, what is the estimated standard enthalpy change of the reaction, \(\Delta H^\circ_{\text{rxn}}\)?
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