Question

what is the number of atoms in 46g of sodium-23

Answer 1

molar mass of sodium =23g/mol
no of moles. =46/23
=2 moles
no of atoms = 2×6.02×10^23
=12.04×10^23 atoms
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Answer 2

$\sf 12.04 \times {10}^{ 23}$

Atomic Number of Sodium is 11