Exercício Resolvido - Quimica Geral (222)

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Chapter 10: Chemical Bonding I: Basic Concepts 
 443 
destabilizing adjacent positive charges. The molecule is expected to be very reactive and 
hence hard to isolate. 
 
Nitrosyl azide 
 Poor resonance forms 
(charge buildup)Good resonance forms
(however, large charge 
separation)
Best resonance forms
(small distance between
charge separation) N N N N O
N N N N O
N N N N O
N N N N O
N N N N O
N N N N O
N N N N ON N N N O
N N N N O
N N N N O
 
Nitrosyl azide is a bent molecule. Based on the best two Lewis structures, we expect that 
the molecule is bent at the two leftmost nitrogen atoms (~ 115 6 + 20 6). 
123. (M) Consider each molecule separately: 
 
B2F4: A total of 34 electrons. Neutral molecule. There are no formal 
charges in the molecule. Free rotation about single bond, with 
the possibility of all atoms being planar. There are no valid 
resonance forms. 
 
BB
F
F F
F
 
N2O4: A total of 34 electrons. Neutral molecule with formal charges. 
 Free rotation about single bond, with the possibility of all 
atoms being planar. There are 3 valid resonance forms. 
 
NN
O
O O
O
 
C2O4
2
: A total of 34 electrons Must be the dianion where the formal 
charges add to the overall charge of the anion. 
 Free rotation about single bond, with the possibility of all 
atoms being planar. There are 3 valid resonance forms. 
 
CC
O
O O
O