Chapter 3, Problem 3.5P

Interpretation Introduction

Interpretation:

The advantage of using counting unit (mole) for the amount of substance over the mass unit.

Concept introduction:

A mole is a unit of measurement that has the same number of particles as that in $12.000\text{ g}$ of $\text{carbon}-\text{12}$. This quantity of particles is named as Avogadro's Number, which is $6.022\times {10}^{23}$. For example-One mole of carbon atom is equal to $6.022\times {10}^{23}$ and has a mass of $12\text{ g}$.

Mole indicates the number of objects in a given mass of the substance.

Mass unit is defined as the unit which describes the mass of an object in a kilogram. It does not signify the number of object.