AP Chemistry
6.7 Bond Enthalpies
6.6 Introduction to Enthalpy of Reaction
The Sabatier process is utilized in spacecraft life-support systems to convert carbon dioxide exhaled by the crew into methane and water vapor according to the following balanced equation:
\[\text{CO}_2(g) + 4\,\text{H}_2(g) \rightarrow \text{CH}_4(g) + 2\,\text{H}_2\text{O}(g)\]
Average bond enthalpies for the chemical bonds involved in this reaction are provided in the table below.
Based on the data in the table, what is the estimated enthalpy of reaction, \(\Delta H^\circ_{\text{rxn}}\), for this process?
\[\text{CO}_2(g) + 4\,\text{H}_2(g) \rightarrow \text{CH}_4(g) + 2\,\text{H}_2\text{O}(g)\]
Average bond enthalpies for the chemical bonds involved in this reaction are provided in the table below.
| Bond | Average bond enthalpy (\(\text{kJ/mol}\)) |
|---|---|
| \(\text{C}=\text{O}\text{ (in }\text{CO}_2\text{)}\) | \(800\) |
| \(\text{H}-\text{H}\) | \(435\) |
| \(\text{C}-\text{H}\) | \(415\) |
| \(\text{O}-\text{H}\) | \(465\) |
Based on the data in the table, what is the estimated enthalpy of reaction, \(\Delta H^\circ_{\text{rxn}}\), for this process?
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