What is the number of representative particles of a substance present in 1 mole of that substance?
Yes, I know it's the
Why should we use such an absurdly large number? Well, it is the link between the micro world of atoms and molecules, and the macro world of grams, and litres.
See this older answer and links. If you can assimilate this knowledge, you will have almost mastered A level and undergraduate chemistry. So see if you can spend a little time on the concept. We will be available to help.