Calculate the mass (in g) of 2.1×1024 atoms of w. calculate the mass (in ) of atoms of . 1.5 ×102g 3.9×102g 2.4 ×102g 6.4 ×102g 3.2 ×102g

is the symbol of tungsten.

Molar mass of  =

Now, number of atoms are converted to number of moles by Avogadro number i.e.

Number of moles of tungsten  =

number of moles  =

=

Therefore,  1 mole of tungsten consist of   atoms

So,   of tungsten consist of atoms.

Number of moles is also equal to

= or

Thus, mass in g of = .