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Part I
a. 4 single bonds, no lone pair on central atom (C)
b. 2 double bonds, no lone pair on central atom (Si)
c. Resonance Structure (3 of them)(2017-2018 Student DO NOT WORRY ABOUT RESONANCE WORK ), 2 single bonds, 1 double bond, no lone pair on central atom (N), bracket & charge since polyatomic ion
d. 6 single bond, no lone pair on central atom. Se has electron configuration with 3rd energy level so it can exceed Octet Rule.
Part II
a. Tetrasulfur nonachloride
b. S1O3
c. Nitrogen dioxide
d. F5Cl1
Part III
a) 161g CO2
b) 2.91mole N2 @STP
c) 4.61E24 molecules S2Cl3