The Gas Phase Reaction of Nitrogen Dioxide and Carbon Monoxide

question 20

Multiple Choice

The gas phase reaction of nitrogen dioxide and carbon monoxide was found by experiment to be second-order with respect to NO₂, and zeroth-order with respect to CO below 25°C. NO₂ + CO  NO + CO₂
Which one of the following mechanisms is consistent with the observed reaction order?

• A)NO₂ + 2CO N + 2CO₂ fast N + NO₂  2NO slow
• B)NO₂ + 2CO  N + 2CO₂ slow N + NO₂  2NO fast
• C)NO₂ + NO₂  NO₃ + NO fast NO₃ + CO  NO₂ + CO₂ slow
• D)NO₂ + NO₂  NO₃ + NO slow NO₃ + CO  NO₂ + CO₂ fast

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