* Molecules are individual units. Think of a molecule like a single water molecule (H₂O) or a single molecule of sugar.

* Moles are a unit of measurement for large quantities. A mole is like a dozen, but instead of 12, it's 6.022 x 10²³ (Avogadro's number) of something.

Therefore, you can't have a "mole" of a single molecule. It's like saying "how many dozens are in one apple?"

To put it another way, you would need 6.022 x 10²³ molecules to make up one mole.