AP Chemistry
6.7 Bond Enthalpies
2.5 Lewis Diagrams
Multi-Unit
Hydrazine, \(\text{N}_2\text{H}_4\), decomposes into nitrogen gas and hydrogen gas according to the following equation.
\[\text{N}_2\text{H}_4\text{(g)} \rightarrow \text{N}_2\text{(g)} + 2\,\text{H}_2\text{(g)}\]
The table below provides average bond energies for the bonds involved in the reaction.
Based on the data in the table, which of the following correctly predicts and explains whether the decomposition reaction is endothermic or exothermic?
\[\text{N}_2\text{H}_4\text{(g)} \rightarrow \text{N}_2\text{(g)} + 2\,\text{H}_2\text{(g)}\]
The table below provides average bond energies for the bonds involved in the reaction.
| Bond | Average bond energy (\(\text{kJ/mol}\)) |
|---|---|
| \(\text{N}-\text{N}\) | \(160\) |
| \(\text{N}-\text{H}\) | \(390\) |
| \(\text{N}\equiv\text{N}\) | \(950\) |
| \(\text{H}-\text{H}\) | \(435\) |
Based on the data in the table, which of the following correctly predicts and explains whether the decomposition reaction is endothermic or exothermic?
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