Chapter 7, Problem 7.5E

(a)

Interpretation Introduction

Interpretation:

The half-life of the reaction has to be determined.

Concept Introduction:

The term half-life of a material means the time taken by that material to reduce to half of its initial amount.  In other words, after the half-life, the number of atoms existing in a material would be half of what it was initially.

(b)

Interpretation Introduction

Interpretation:

The appearance of the molecular image at $8.0\text{ s}$ is to be drawn.

Concept Introduction:

The molecular image can be determined by calculating the number of atoms, the molecule X contains after $8.0\text{ s}$ has elapsed. The concentration of a molecule after a particular time can be calculated as shown below.

    $A_t=A_0{e}^{-kt\text{'}}$