Chapter 3, Problem 3.12QP

Interpretation Introduction

Interpretation:

The thickness of the book in light years has to be calculated.

Concept Introduction:

Mole Concept:

1. 1. A mole is a word that represent a number much like a dozen.
2. 2. One mole of atoms or molecules or ions is $6.02\times {10}^{23}$.
3. 3. The average atomic mass of any element expressed in grams provide exactly one mole of that element.
4. 4. This concept allows the chemist to count by weighting.