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Question

If NA is Avogadro’s number, then the number of valence electrons in 4.2 g of azide ions (N3) are:

A
4.2 NA
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B
2.4 NA
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C
1.6 NA
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D
3.2 NA
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Solution

The correct option is C 1.6 NA
Number of moles of azide ions=given massmolar mass=4.242=0.1 mole

Number of valence electrons in a nitrogen atom = 5
So, number of valence electrons in N3=3(5)+1=16
Number of valence electrons in 0.1 mole=16×0.1×NA=1.6 NA

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