Chapter 12, Problem 12.26CP

(a)

Interpretation Introduction

Interpretation:

The picture has to be drawn to show the number of $\text{A}\text{and}\text{B}$ molecules after the given reaction time.

Concept introduction:

Rate of reaction:

The rate of a reaction is defined by the change in concentration of substrate (reactant) or target (product) with change in time.

$\text{Rate}\text{=}\frac{\text{Concentration}\text{change}\left(\text{in}\text{reactant}\text{or}\text{product}\right)}{\text{Time}\text{change}}$

(b)

Interpretation Introduction

Interpretation:

For the given reaction, the half-life time has to be given.

Concept introduction:

Half-life time:

It is the time required for the reactant (substrate) concentration reduces to one-half of its initial concentration.

$\begin{array}{l}{\text{t}}_{\text{1/2}}\text{=}\frac{\text{0}\text{.693}}{\text{k}}\\ \text{where,}\\ {\text{t}}_{\text{1/2}}\text{-}\text{half-life}\text{time}\\ \text{k}\text{-}\text{rate}\text{constant}\end{array}$