What is a #"mole"#?
The mole is simply a number such as a
Of course, the mole is an exceedingly large number, i.e.
The use of the mole allows us to establish chemical equivalence by means of mass, and (sometimes) by volume. If I have a mass of something of known formula, I know precisely the number of molecules or atoms that constitute that mass. And thus I can establish stoichiometric equivalence by means of mass or volume.
This principle is basic to the study of the chemistry, and is worth spending some time on in order to get it right.