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

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Q. If $N_A$ is Avogadro’s number then number of valence electrons in $4.2\, g$ of nitride ions $\left(N^{3-}\right)$

Some Basic Concepts of Chemistry

Solution:

$14 \,gm \,N^{3-}$ ions have $8N_A$. valence electrons
$4.2 \,gm$ of $N^{3-}$ ions have $=\frac{8N_{A}\times4.2}{14}=2.4N_{A}$