Bond enthalpies are shown in the table:
| Bond | Bond enthalpy / kJ mol−1\text{kJ mol}^{-1}kJ mol−1 |
|---|---|
| C-H\text{C-H}C-H | 413 |
| C-O\text{C-O}C-O | 358 |
| C=O\text{C=O}C=O | 805 |
| O-H\text{O-H}O-H | 464 |
| O=O\text{O=O}O=O | 498 |
What is the enthalpy change, in kJ mol−1\text{kJ mol}^{-1}kJ mol−1, for the reaction below?
HCHO(g)+O2(g)→CO2(g)+H2O(g) \text{HCHO(g)} + \text{O}_2\text{(g)} \rightarrow \text{CO}_2\text{(g)} + \text{H}_2\text{O(g)} HCHO(g)+O2(g)→CO2(g)+H2O(g)−409-409−409
−281-281−281
+281+281+281
+409+409+409
