You can find all my A Level Chemistry videos fully indexed at https://www.freesciencelessons.co.uk/... In this video we continue looking at how we use the Avogadro constant in A level Chemistry. In the last video we looked at how to calculate the number of molecules of a chemical. In this video, we take this idea further and look at how to use the Avogadro constant to calculate the number of atoms in a given mass of compound and the number of electrons in a given mass of an element. This video is aimed at the UK A Level Chemistry specifications. Students studying International A Level Chemistry will need to check their specification.