Q.:- Which has more number of atoms, 100 grams of sodium or 100 grams of iron (given atomic mass of Na = 23 u, Fe = 56 u) ?

Answer:-

100 g of sodium:

Number of sodium atoms

= 2.62 x 10²⁴ atoms.

100 g of iron :

Number of iron atoms

= 1.07 x 10²⁴ atoms

Thus, 100 g of sodium has more atoms.