Mole vs Molecule: What's the Difference?
These two words look alike, sound alike, and turn up in the same sentence constantly — so it's no surprise students swap them. But they describe completely different kinds of thing, and once you see the difference you'll never mix them up again. The short answer: a molecule is a particle — two or more atoms chemically bonded together. A mole is a counting unit — about 6.022 × 10²³ of something, the way "dozen" means 12. A molecule is a thing; a mole is an amount of things. Quick comparison at a glance Feature Mole Molecule What it is A unit of amount A physical particle What it tells you How many particles you have What the particle is made of Abbreviation mol Written as a formula (H₂O, CO₂) Size 6.022 × 10²³ particles Usually under a nanometre Everyday analogy "A dozen" "An egg" Can you see one? A mole of water is about 18 mL — yes No, far too small Example 1 mol of water = 6.022 × 10²³ water molecules One water molecule = 2 H + 1...