Mole Concept

The mole is used to count entities on the microscopic scale like atoms and molecules. One mole contains 6.02 x 1023 particles, which is the number of atoms in exactly 12 grams of carbon-12. Carbon-12 is used as a standard for relative atomic mass because its atomic weight can be precisely defined as 12 grams per mole. The constant 6.02 x 1023, known as the Avogadro number, relates the number of particles in one mole of a substance to the mass in grams of that amount of substance.