What is the number of nitrogen-based electrons in a 4.2⋅g mass of nitride anion?

A. 0.30×NA;
B. 30×NA;
C. 3.0×NA;
D. 4.2×NA;
E. cannot be determined...

1 Answer
anor277
May 2, 2017

Well, nitrogen has Z=7............

Explanation:

And if Z=7, and we have N3−, we have 10 electrons per atom, i.e. 10⋅e−×NA electrons per mole of nitride anion.

But we have a mass of 4.2⋅g, which corresponds to a molar quantity of 4.2⋅g14.01⋅g⋅mol−1=0.30⋅mol.

And thus in a 0.30⋅mol quantity of nitride anion, there are 10×0.30⋅mol×NA quantity of electrons........ So we choose option c.

Good question, I am stealing this.

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