* 6.022 x 10^23 carbon atoms. This is Avogadro's number, which represents the number of atoms or molecules in one mole of any substance.

* 12.011 grams of carbon. This is the atomic mass of carbon, which is the average mass of a carbon atom in atomic mass units (amu).

So, 1 mole of carbon atoms is a specific quantity that contains a huge number of atoms, but it also has a specific mass that can be measured in grams.