Question: how many moles of carbon atoms are in 0.500 mole of c2h6?
Answer: There is one mole of carbon atoms in a 0.500-mole sample of C2 H6. (1 mole of anything is 1 mole. The subscript tells the number of atoms of an element in one molecule. There are 2 moles of carbon in one mole of C2H6.