the total no. of electron in 4.2gm of N3- ion is
2.1NA
4.2NA
3NA
3.2NA
where,NA is the avogadro no.
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n=no of electrons ÷N.A. but n is not given so n=mass in gram ÷molar mass
so your formula becomes no of electrons =m÷M ×N.A.
so your formula becomes no of electrons =m÷M ×N.A.
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