Question

Which of the following has the greatest mass? 1 mole of uranium (U) 1 mole of oxygen (O) 1 mole of sodium (Na) 1 mole of chlorine (Cl)

Answer 1

1 mole of sodium hope it helps 

Answer 2

1 mole of uranium is 235g making it the heaviest and there are 6.02•10^23 atoms.