The Mole

One mole of atoms or molecule of any substance will have a mass in grams equal to the relative atomic mass or relative molecular mass for that substance.

The atomic mass of carbon is 12, therefore one mole of carbon weighs 12g

The relative molecular mass of oxygen (O₂) is (2 x 16) 32, therefore one mole of oxygen weighs 32g.

One mole of any substance contains 6.02 x 10²³ atoms or molecule.

Remember the mole is just a number!