Chemistry / Unit 3 Chem 0367 short lesson, about 20 seconds
The Mole
Captions available
The idea
The mole is chemistry's counting unit, defined so one mole of any substance contains one fixed number of entities.
In practice
A mole works like "dozen," extending everyday counting in groups down to particles too small to count by hand.
Where people slip
A mole counts particles; it names no mass by itself, though every mole of a substance has its own mass.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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