Question

Calculate the number of valence electrons in 4.2 g of N−3 ion.

1.2.1NA
2.4.2NA
3.1.6NA
4.3.2NA
plz give me the answer fast​

Answer 1

Explanation:

Molecular wt of N3−=3×14=42 g

One ion of N3− has valence electrons = 3×5+1=16

42 g N3−=NA N3− ion

valence electrons in NA ions = 16NA (where NA = Avogadro's number)

So, 1 g of N3− will have valence electrons = 16NA/42

therefore,4.2g of N3− ion will have valence electrons = 16NA×4.2/42=1.6NA.

Option C is correct.

Hope This will help you

Answer 2

Answer:

3. 1.6NA

Explanation:

I think this is correct answer