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Question

​​​Calculate the total ions and charge present in 4.2 gram ofN^3-.

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Solution

Nitrogen-Symbol-N -7(atomic number)
N³⁻ ion = 1s²2s²2p⁶
Total number of electrons =10
atomic mass of N=14
14g of N³⁻ ion contains 10NA electrons
where NA - Avagadro number
so, 1 g of N³⁻ ion =10NA/14
∴4.2g of N³⁻ ion =4.2x 10NA/14
=3NA


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