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Question 9
60%

The gas-phase pyrolysis of acetaldehyde (CH3CHO\text{CH}_3\text{CHO}CH3​CHO) 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}) CH3​CHO(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?

A

1.51.51.5

B

2.52.52.5

C

3.53.53.5

D

4.54.54.5

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  1. A Level
  2. /Chemistry
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29 exam-style questions on OCR A A Level Chemistry How fast?. Each one has a worked solution and a mark scheme showing where the marks go.

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