Question: how many atoms are in 4 moles of silicon?
Answer: Since 1 mole of silicon contains 6.023 x 10^23 atoms, 4 moles will contain: (4 moles) x (6.023 x 10^23 atoms) = 2.4092 x 10^24 atoms. Thus, 4 moles of the silicon element contains about 2.4 x 10^24 atoms.