Moles in chemistry - explained clearly! 

Moles are one of those concepts that ALWAYS confuses students of chemistry, yet if you understand what they are you'll be able to do all kinds of calculations and conversions. Oh, and pass your exams! Who wouldn't want to do that? So in this video we'll look at what a mole is, why we need moles in the first place and how we use moles in calculations - in fact, we'll work through six example questions so you get the hang of using moles properly.
This video is suitable for chemistry students of ALL ages, and there's a related video on mole calculations.