The number of things in a mole is arbitrary. It's a dimensionless unit. However, since many things are already measured in moles in chemistry, there's no real r

The number of things in a mole is arbitrary. It's a dimensionless unit. However, since many things are already measured in moles in chemistry, there's no real reason to remove it. Dealing with numbers on a more practical macroscopic scale is probably more convenient than dealing with large powers of 10. https://en.wikipedia.org/wiki/Mole_(unit)#Criticism https://en.wikipedia.org/wiki/Mole_(unit)#Criticism