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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-))`

A

`2.4 N_(A)`

B

`4.2 N_(A)`

C

`1.6 N_(A)`

D

`3.2 N_(A)`

Text Solution

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The correct Answer is:
A
No. of moles of nitride ion
`=(4.2)/(14)= 0.3 mol = 0.3 xx N_(A)` nitride ions.
Valence electrons `= 8 xx 0.3 N_(A) = 2.4 N_(A)`
(5+3 due to charge). One `N^(-3)` ion contains 8 valence electrons.
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Atoms and molecules are so small in size that it is neither possible to count them individually nor possible to determine their mass. These are counted collectively in terms of Avogadro's number. The mass of Avogadro's number of atoms and molecules of a substance is known as gram atomic mass and gram molecular mass respectively. The volume occupied by Avogadro's number of molecules of a gas or vapour, is known as molar volume. If N_(A) is Avogadro's number, the number of valence electrons in 4.2 g of nitride ions (N^(3-)) is

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