Question

Total number of electrons in 4.2g of N^3-ion

Answer 1

No of moles in 4.2g of N =4.2/14 = 3/10molesNow find out electrons in N^3- We know N have 7 electrons after taking 3e it will make N^3- hence total no. Of electrons is 7+3=10...... Now 4.2 gm N^3- i.e. 3/10 moles of this ion will have 3/10 ×10×NA(6.022 ×10^23) ions = 3NA electrons will be final answer