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  4. If NA is Avogadro's number then number of valence electrons in 4.2 g of nitride ions N3- is

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Q. If $N_A$ is Avogadro's number then number of valence electrons in 4.2 g of nitride ions $N^{3-}$ is

Some Basic Concepts of Chemistry

Solution:

$14\,g$ of $N^{3-}$ ions have valence electrons $=8N_{A}$
$4.2\,g$ of $N^{3-}$ ions have valence electrons
$=\frac{8N_{A}\times 4.2}{14}=2.4\,N_{A}$