If N(A) is Avogadro's number then number...

If `N_(A)` is Avogadro's number then number of valence electrons in 4.2 g of nitride ions `(N^(3-))`

`2.4 N_(A)`

`4.2 N_(A)`

`1.6N_(A)`

`3.2N_(A)`

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The correct Answer is:

`14 g N^(3-)` ions have `= 8N_(A)` valence electrons
4.2g of `N^(3-)` ions have `= (8N_(A) xx 4.2)/(14) = 2.4N_(A)`

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