02 - What is Avogadro's Number & the Mole in Chemistry? Part 1

Get more lessons like this at http://www.MathTutorDVD.com In this lesson, we learn about Avogadro's number, which specifies the unit of the mole (mol) in chemistry. We use avogadro's number in almost every calculation in chemistry because it relates how many grams of a substance are in a known quantity (mol) of atoms of molecules of that substance.