Chapter 14, Problem 14.131MP

Interpretation Introduction

Interpretation:

The concentrations of $\text{NO,}\text{}\text{}{\text{O}}_{\text{2}}\text{and}{\text{NO}}_{\text{2}}$ needs to be determined.

Concept introduction:

A reaction is said to be third order, if sum of exponents in rate law is equal to 3. The reaction is as follows:

$\text{2NO}\left(\text{g}\right){\text{+O}}_{\text{2}}\left(\text{g}\right)\to 2{\text{NO}}_{\text{2}}\left(\text{g}\right)$

Therefore,

$\text{Rate}=k{\left[\text{NO}\right]}^{\text{2}}\left[{\text{O}}_{\text{2}}\right]$.

Above reaction is third order because sum of exponents in rate law is equal to 3.