eli5 How did Avogadro get the number for a mole?

Question

I understand how a mole works, however, I have no clue how Avogadro got the specific number of 6.02×10^23.

In: 68

Answer 1

It’s roughly the number of protons and neutrons in one gram of whatever you have. The mass of a proton and neutron is close enough to the same and electrons are negligible so we can ignore them. Given that, if you have one gram of something – anything – and divide it by the mass of a nucleon, you get Avagadro’s number of nucleons.