Chemical amounts are measured in moles. The symbol for the unit mole is mol.
The number of atoms, molecules or ions in a mole of a given substance is the Avogadro constant. The value of the Avogadro constant is 6.02 x 10 to the 23 per mole.
The mass of one mole of a substance in grams is equal to its relative formula mass.
Use the relative formula mass of a substance to calculate the number of moles in a given mass of that substance and vice versa.
The number of particles in a substance can be calculated using:
the Avogadro constant (6.02 × 1023)
the amount of substance in mol
Number of particles = Avogadro constant × the amount of substance in mol
