the atomic mass of tungsten is 183.84 grams this is the mass of one mole of tungsten we know that one mole of any substance contains Avagadro number of atoms or molecules or ions. So one mole of tungsten metal will have 6.023 X 10^23 atoms thus mass of 6.023 X 10^23 atoms is 183.84 grams hence mass of single atom = 183.84/ 6.023 X 10^23 atoms = 30.52 X10^-23 = 3.052 X 10^-22 g
