# How does "Avogadro's number" relate to the atomic mass of ""^12C isotope?

I think you would agree this of that atom. If instead of 1 atom of carbon-12, I had exactly Avogadro's number of carbon-12 atoms, I would have a mass of 12 grams precisely. Avogadro's number (which you will certainly not need to memorize is approx. $6.022 \times {10}^{23}$. Avogadro's number is the link between atoms and molecules, to the macro world of grams and kilograms.