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  1. Hace 9 horas · It is an amount unit, and might be compared to a pair and a dozen. It is a specific measure of the number of atoms, or molecules, in a given sample of matter. Technically, one mole is the number of atoms in exactly 12 grams of pure carbon-12. That number is a constant known as Avogadro’s number (6.02214076×10 23 ).