# Chapter 2 - Sections 2.1-2.9 - Exercises - Review Questions: 27

A mole is a unit representing $6.022\times10^{23}$ particles. $6.022\times10^{23}$ is Avogadro's number.

#### Work Step by Step

The mole is a useful conversion factor that can be used in calculations involving the number of atoms in a sample or its mass. Elements have a consistent mass per mole.

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