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Add formal charges to each resonance form of hcno below.based on the formal charges you added above, which structure is favored?

Kathy Robinson

in Chemistry

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Kyle Mckinney on June 30, 2018

Q1)formal charges for the atoms are assigned, this load can be calculated using the following formula;f.c = number of valence electrons - non-bonding electrons around the atom - the number of bonds3 structures have been given enables us to calculate for each structure A. charges for the atoms of H = 1-0-1=0C = 4 -4-2 = -2N = 5 - 0-4 = 1 = 6 - 2 - 3 = 1B.H = 1-0-1 = 0C = 4 - 0 - 4 =0N = 5 - 0 - 4 = 1 = 6 - 6 - 1 = -1C.H = 1-0-1 = 0C = 4 - 2 - 3 = -1N = 5 - 0 - 4 = 1 = 6 - 4 - 2 = 0Q2)the next thing that we need to see that the structure is the most favored nation.the structure with the lowest number of atoms that have a charge.the structure B and C have 2 atoms with loads while A has three atoms with charges, including that of an atom with a -2 charge, which is not common. so that A structure can be ignored.another rule of thumb is that the more electronegative atom should have more negative charge than less electronegative atoms. In the structure of the C, Carbon, the least electronegative atom in comparison to N and O, has the value -1, and its more negative than the charges on N and O. the structure B on the other side, Or the more electronegative atom has a -1 charge and C has 0 charge. Therefore, the most favored of the structure is B.


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