Chapter 7, Problem 15PE

(a)

Interpretation Introduction

Interpretation:

The number of grams in one atom of helium has to be given.

(b)

Interpretation Introduction

Interpretation:

The number of grams in $15$ atom of carbon has to be given.

(c)

Interpretation Introduction

Interpretation:

The number of grams in four molecules of ${\text{N}}_{\text{2}}{\text{O}}_{\text{5}}$ has to be given.

(d)

Interpretation Introduction

Interpretation:

The number of grams in $\text{11}$ molecules of ${\text{C}}_{\text{6}}{\text{H}}_{\text{5}}{\text{NH}}_{\text{2}}$ has to be given.