How many atoms are there in 12 grams of Carbon?

12 grams 12.01 moles 6.02x10^23mol
x x
1 gram 1 atom

= 867.6024
Is this correct?

no.

First how many moles are in 12 grams?

12/12.01 round to 1 mole.

How many things is in one mole? 6.02*10^23