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

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4gm of NaOH

5.6 gm of $N a_{3} P O_{4}$

6.85 gm of NaCl

0.25 mole of $N a_{2} S O_{4}$

answer is A.

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Detailed Solution

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.

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