Question: how many atoms are in three moles of carbon?
Answer: Well in one mole of every substance there are avagadro number of particles i.e atoms,molecules etc. Here one mole refers to 12gram of pure C-12 carbon. Avagadro number is roughly 6.022 ×10^23 . So in 3 moles of carbon there are 18.066 ×10^23 atoms.