1 mol is the amount of substance that contains the same number of particles as there are atoms in 12.0 g of carbon-12.

Celebrated annually on October 23 from 6:02 a.m. to 6:02 p.m., Mole Day commemorates "Avogadro's Number": 6.02 x 10 23. This number--called a mole--is a basic measuring unit in chemistry. Mole Day ...

1 mol is the amount of substance that contains the same number of particles as there are atoms in 12.0 g of carbon-12.