Question

How many carbon atoms of mass 12.00 a m.u. are in 12.00 g of C?

Answer 1

To a first approximation, there are Avogadro's number of such carbon atoms, i.e. `6.022xx10^23` carbon atoms.

Explanation:

By definition, there are Avogadro's number of carbon atoms in `12.00` `g` of `""^12C`. The atomic mass of `C` on the Periodic Table appears as `12.011` `g` because of the existence of `""^13C` and `""^14C` isotopes, which slightly inflate the molar mass.