While we are familiar with counting with the unit of dozen, it will take some time for you to get accustom to counting with the unit of mole. But don't be discouraged, it's not difficult.
Just remember,
| Dozen | used to count typical visible quantities eg. marbles, oranges, pencils ... etc |
|---|---|
| Mole | used to count extremely small particles, eg. atoms, molecules, ions, electrons, protons, formula units ... etc |