Question

Solve this:
Q. If NA is Avogadro's number then number of electrons in 4.2 g of N-3
(1) 2.1 NA
(2) 3 NA
(3) 6 NA

Answer 1

Hey Mate your answer is 3 NA

Explain....

•atomic mass of N = 14 gm
•total mass of e- in N = 10
•if 14 gm N3 contain = 10NA e-
•then 1 gm of N3 = 10NA/14
•So 4.2 gm of N3 = 4.2x10NA/14 = 3NA

hope it help you
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Thnxx♥

Answer 2

Answer:

2.1Na

Explanation:

Moles=given mass/total mass

4.2/14

=0.3moles

Number of electrons in an atom =moles x na x number of electron

0.3 x na x 7

2.1