How many atoms in 35 mol carbon dioxide?

1 mol of any substance contains 6.02 x 1023 constituent particles. This is the avogadro constant. So in 35 moles of CO2, there would be 35 x 6.02 x 1023 molecules of CO2. In each CO2 there are three atoms (one carbon and two oxygen). Therefore the total number of atoms in 35mol of CO2 is 3 x 35 x 6.02 x 1023 = 6.32 x 1025