One mole of

units()

contains twice as many carbon atoms.

So

2 X =
atoms of carbon

12 grams of

must be converted to moles first,
(divide by its formula mass (60atomic mass units)).

12 grams/60 atomic mass units
= 0.2mole.
So! the number of mole of carbon atoms is 2 X 0.2 =0.4mole.

So the number of atoms of carbon is
0.4 X =