Work out moles to molecules instantly with clear inputs, formula shown and shareable results.
One mole is defined as exactly 6.02214076x10^23 entities, so converting an amount of substance into a particle count is a single multiplication by the Avogadro constant. Multiplying again by the number of atoms in each formula unit gives the total atom count, which is why 2 mol of a triatomic molecule holds three times as many atoms as molecules.
Particle count
molecules = moles x 6.02214076e23
Atom count
atoms = molecules x atoms per formula unit
Exactly 6.02214076x10^23 - the Avogadro constant has been a fixed defined value since the 2019 SI redefinition, so it is not a measured figure any more.
Because most molecules contain several atoms. Water has three atoms per molecule, so a mole of water holds 6.022x10^23 molecules but 1.807x10^24 atoms.