If you have 2.180 mol of chlorine atoms, how many chlorine atoms are present?

6.022x 10^23 is Avogadro’s number. You use this when you have one mol of a molecule, atom, or formula unit.

Multiply everything on the top = 1.31 x 10^24
Multiply everything in the bottom = 1
Divide top and bottom = 1.31 x 10^24

The molecules contain like 54 of water 

Woah that’s a lot to read xd i’ll try though. i’ll get back t you if. i know the andwer