The sample(s) containing same no. of Na atom as there are Na atoms in 5.3 gm of $N{a}_{2}C{O}_3,$ is/are

Na₂CO₃ contains two Na atoms per molecule, the number of Na atoms in 5.3 g of Na₂CO₃ is:

2 x 0.05 mol Na₂CO₃ x 6.022 x 10²³ Na atoms/mol = 6.022 x 10²² Na atoms

the number of Na atoms in 5.3 g of Na₂CO₃is:

4gm of NaOH = 0.1 x 6.022 x 10²³ Na atoms/mol = 6.022 x 10²² Na atoms.