I have learned about the applications of the mole, that it is used in almost all parts of chemistry. From percent composition, to gas laws, to stoichiometry. I was surprised and expectant of the same thing, oddly enough, the sheer size of a mole. I was expecting it to be large, given the diminutive size of an atom. But a mole has 23 0’s….. 23!!! A person could have a mole of dollars, spend a million dollars a day and still die a Rockefeller. So, mind blow. It seems common sense to me how useful it is, putting atoms on a workable scale was a terrific achievement. It’s unfortunate that avagadro’s colleagues didn’t understand the importance in that until after he was dead. And now, chemistry cat.