The gas-phase pyrolysis of acetaldehyde (CH3CHO\text{CH}_3\text{CHO}CH3CHO) is a key reaction in atmospheric chemistry and organic decomposition:
CH3CHO(g)→CH4(g)+CO(g) \text{CH}_3\text{CHO}(\text{g}) \rightarrow \text{CH}_4(\text{g}) + \text{CO}(\text{g}) CH3CHO(g)→CH4(g)+CO(g)At 800 K, the rate constant k k\,k for this reaction is measured as 0.35 dm4.5 mol−1.5 s−10.35\text{ dm}^{4.5}\text{ mol}^{-1.5}\text{ s}^{-1}0.35 dm4.5 mol−1.5 s−1.
What is the overall order of this reaction?
1.51.51.5
2.52.52.5
3.53.53.5
4.54.54.5
