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Which has more number of atoms, 100 g, 100 gms of sodium or 100 gms of sodium or 100 gms of iron (given, atomic mass of Na = 23u, Fe = 56u).

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Atomic mass of sodium = 23u (data)

It means gram atomic mass of sodium = 23 gm

Now atoms present in 23 gm sodium = 6.022 × 1023

\(\frac{6.022 \times 10^{23}}{23}\times 100\)

It means Number of atoms in 100 gm sodium = 1.6753 × 1024

∴ 100 gm sodium has more number of atoms rather than 100 gms of iron.

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