How are a mole and a dozen similar?

Each represents a certain mass of material.

Each names a given number of objects.

Each identifies a specific volume.

Each measures a given number of amus.

A mole is the same idea as a dozen, but the number involved is a lot bigger than 12. In fact, one mole is equal to 6.02 x 1023 items. This number is also called Avogadro's Number, and is sometimes abbreviated NA. Memorize this conversion factor!