Chemistry / Chem 0367 · Atom · ~20 seconds
The Mole
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The mole is chemistry's counting unit, defined so one mole of any substance contains one fixed number of entities.
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A mole works like "dozen," extending everyday counting in groups down to particles too small to count by hand.
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A mole counts particles; it names no mass by itself, though every mole of a substance has its own mass.