Problem: The reaction NO2 + CO2 → CO + NO3 has a rate law that is second order in NO2. Which of these statements describes the mechanism that explains this unexpected rate law?1. A multi-step reaction mechanism in which a first bimolecular collision between NO 2 molecules is the rate determining step.2. A single-step reaction mechanism in which a bimolecular collision between NO 2 molecules is the rate determining step.3. A single-step reaction mechanism in which a bimolecular collision between NO 2 and CO2 is the rate determining step.4. Amulti-step reaction mechanism in which a first unimolecular decomposition of NO 2 is the rate determining step.5. A single-step reaction mechanism in which a first unimolecular decomposition of NO 2 is the rate determining step.

FREE Expert Solution

We're being asked to identify the correct explanation of why the reaction NO2 + CO2 → CO + NO3 has a rate law that is second order in NO2


When a reaction mechanism is given, the rate law can be determined using the slow step in the reaction mechanism.

 rate law only involves the reactants
▪ the coefficients of the reactants in the slow step are the order of the reaction with respect to that reactant


The molecularity of a reaction is the number of molecules involved in a reaction:

• unimolecular – 1
• bimolecular – 2
• termolecular – 3
• tetramolecular – 4


Now let's analyze each statement given:

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Problem Details

The reaction NO2 + CO2 → CO + NO3 has a rate law that is second order in NO2. Which of these statements describes the mechanism that explains this unexpected rate law?

1. A multi-step reaction mechanism in which a first bimolecular collision between NO 2 molecules is the rate determining step.

2. A single-step reaction mechanism in which a bimolecular collision between NO 2 molecules is the rate determining step.

3. A single-step reaction mechanism in which a bimolecular collision between NO 2 and CO2 is the rate determining step.

4. Amulti-step reaction mechanism in which a first unimolecular decomposition of NO 2 is the rate determining step.

5. A single-step reaction mechanism in which a first unimolecular decomposition of NO 2 is the rate determining step.

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