How much is a mole in chemistry? Like the mathematical term.

Well on a side note, a mole in chemistry is also the same as a Liter. A mole however, is the mass of an element, or compound. 1 mol of O would be 15.9994 grams/mol. It can also be represented as 6.022*10 to the 23 power. (1 mol of Carbon-12 atoms)