What is mole exactly? Some would say mole is 6.02 x 10ēģ. But to most people, that number means nothing. Mole was created by Avogadro, and the International Union of Pure and Applied Chemistry Defines Mole as the following: The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon-12. When the mole is used, the elementary entities must be specified and may be atoms, molecules, ions, electrons, other particles, or specified groups of such particles. Basically, mole is a unit of measurement that is used in science to make it easier to measure elements (because of their small size). 6.02 x 10ēģ is one mole of anything, but when you mention one mole of an element, that is how many molecules is being talked about.