Chapter U4.75, Problem 1E

Interpretation Introduction

Interpretation:

The use of mass to count larger number of objects needs to be explained.

Concept introduction:

Mass is the amount of matter present in a substance.

Answer to Problem 1E

Mass is one useful unit to count larger number of objects, for example,counting of atoms by grams.

Explanation of Solution

If $6.023\times {10}^{23}$ number of oxygen atoms need to be counted then easily it can be done by taking the mass of the atom. Mass of $6.023\times {10}^{23}$ number of oxygen atoms is the gram atomic mass which is 16 g.

This is because in 1 mol of an atom there are $6.023\times {10}^{23}$ units and molar mass of oxygen is 16 g/mol thus, 16 g of oxygen atom has $6.023\times {10}^{23}$ atoms of oxygen.