9th Edition
Steven S. Zumdahl
ISBN: 9781133611097




9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

The mechanism for the gas-phase reaction of nitrogen dioxide with carbon monoxide to form nitric oxide and carbon dioxide is thought to be

NO 2 + NO 2 NO 3 + NO S l o w NO 3 + CO NO 2 + CO 2 F a s t

Write the rate law expected for this mechanism. What is the overall balanced equation for the reaction?

Interpretation Introduction

Interpretation: A proposed mechanism of gas-phase reaction of nitrogen dioxide is given. The rate law and overall balanced equation for the reaction is to be determined.

Concept introduction: The change observed in the concentration of a reactant or a product per unit time is known as the rate of the particular reaction. The differential rate law provides the rate of a reaction at specific reaction concentrations.

To determine: The rate law of the given reaction.


The slow step of reaction mechanism is rate determining step. In the given mechanism of a reaction, first step is slow step. Hence, it is a rate determining step.

The proposed first step mechanism is,


The rate law gives the relation between reaction rate and concentration of reactants. The given reaction consists of two reactants, that is, NO2 . Hence, the rate law for the given reaction is,



  • k is rate constant.
  • [NO2] is concentration of reactant.

To determine: The overall balanced equation of the given reaction

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