A mole (mol) is the SI unit of amount of substance, defined as the amount that contains as many elementary entities as there are atoms in 12.000 g of carbon-12 (¹²C). One mole therefore always contains the same number of entities, given by Avogadro's number. The mole links the mass of a sample to the number of particles it contains, which is essential for stoichiometric calculations.

摩尔(mol)是物质的量的国际单位,定义为所含基本单元数与 12.000 g 碳-12(¹²C)中原子数相同的量。因此,1 摩尔总是含有相同数目的基本单元,该数目即阿伏伽德罗常数。摩尔将样品的质量与其所含粒子的数目联系起来,这对化学计量计算至关重要。