Problem: How many resonance structures exist for the formate ion, HCO2-?Express your answer as an integer

FREE Expert Solution

(1) Hydrogen can never be the central atom. 

C → less electronegative atom than O → central atom


(2): Calculate the total number of valence electrons present.          

HCO2-:

           Group              Valence Electrons

H         5A                     1 x 1 e=   1 e

C         4A                     1 x 4 e=   4 e
O         6A                     2 x 6 e=  12 e
                                    Total = 17 valence e- 

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Problem Details

How many resonance structures exist for the formate ion, HCO2-?

Express your answer as an integer