One atom of an element weighs 3.32 x 10^-23 g. How many number of gram atoms are there in 20 kg of the element?

Atomic mass of an element
= Mass of one atom x N_a
= 3.32 x 10^-23  x  6.023 x 10²³ = 19.99 $\simeq$20 g
No. of gram atoms $=\frac{ \mathrm{Mass} \mathrm{of} \mathrm{element} \mathrm{in} \mathrm{gram} }{ \mathrm{Atomic} \mathrm{mass} \mathrm{in} \mathrm{gram} }=\frac{20\times 1000}{20}=1000$