How many atoms are in 2.0 mol of Cu?
The mole is simply a number: specifically,
So the fact that you are looking at copper in particular is irrelevant if you're just looking for the number of atoms in 2 moles of a substance.
In order to work this out, multiply Avogadro's number - the one I stated at the start of this explanation - by
In other words, 1 mole of atoms is