Chapter 17, Problem 17B.1ST

Interpretation Introduction

Interpretation:

For a particular experiment it was found that the concentration of ${\text{N}}_{\text{2}}{\text{O}}_{\text{5}}$ varied with time as follows:

  $\begin{array}{l}\text{t/s 0 200 400 600 1000}\\ {\text{[N}}_{\text{2}}{\text{O}}_{\text{5}}{\text{](mol dm}}^{\text{-3}}\text{) 0}\text{.110 0}\text{.073 0}\text{.048 0}\text{.032 0}\text{.014}\end{array}$

It has to be confirmed that the above reaction is first order and the rate constant has to be determined.

Concept Introduction:

Rate of a reaction:

Rate of a reaction is the change in concentration of reactant or product per unit time.  It is expressed in terms of decrease in concentration of any of the reactants and increase in concentration of any of the products.

First order reaction:

First order reaction is a reaction in which the rate is depend only on one reactant concentration.

Example:

    ${\text{2N}}_{\text{2}}{\text{O}}_{\text{5}}\text{(l) }\stackrel{}{\to }{\text{ 4NO}}_{\text{2}}{\text{(g) + O}}_{\text{2}}\text{(g)}$