Q. 18

Write Lewis structure of the following compounds and show formal charge on each atom.

HNO3, NO2, H2SO4

Answer :

Formal charge = valence electrons- (lone pair electrons + 1/2 bounded electrons)


(i) Formal charge calculations:


For N: 5 – 1/2 (8) = +1


For O: 6 – 6 – 1/2 (2) = -1


no2.png


(ii) Formal charge calculations:


For N: 5 – 1/2 (8) = +1


For O without H: 6 - 6 - (1/2)2 = -1


For O without H on left side of N:6-4-1/2 (4)= 0


For O with H: 6 - 4 - (1/2)4 = 0


hno3.png


(iii) Formal charge calculations:


For S: 6 - (1/2)8 = +2,


For O without H: 6 - 6 - (1/2)2 = -1,


For O with H: 6 - 4 - (1/2)4 = 0.


h2so4.png


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