Chapter 7, Problem 21PE

(a)

Interpretation Introduction

Interpretation:

The number of hydrogen atoms in $\text{25}$ molecules of ${\text{C}}_{\text{6}}{\text{H}}_{\text{5}}{\text{CH}}_{\text{3}}$ has to be given.

(b)

Interpretation Introduction

Interpretation:

The number of hydrogen atoms in $\text{3}\text{.5}\text{mol}$ of ${\text{H}}_{\text{2}}{\text{CO}}_{\text{3}}$ has to be given.

(c)

Interpretation Introduction

Interpretation:

The number of hydrogen atoms in $\text{36}\text{g}$ of ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}\text{OH}$ has to be given.