# What is the difference between mole and molecule?

A mole is a certain quantity of molecules, namely the Avagadro number of molecules ${N}_{A} = 6.023 \times {10}^{23}$.
So for example if you take $6.023 \times {10}^{23}$ water molecules then that makes up 1 mole of water.
Its mass would be the molar mass of water, meaning that 1 mole of water with that large number of particles has a mass of ${M}_{r} = 1 + 1 + 16 = 18 g / m o l$.