Question

Academic Year 2019-20 Chem 06.100: Molecular Geometry and VSEPR Theory Species & No. Valence Lewis Structure Electron Domain Geometry Molecular Geometry Perspective (30) Drawing w/labeled Bond Angles Molecular Shape Designation AXE. Formal Charge on Each Atom Polar or Non-polar? н CHA Trigonal Pyramidal Tetrahedral 109.5 AX: H-C-H H CO H=0 Non-polar 8 NH) Trigonal Tetrahedral Pyramidal 100 HO TH-N-H Ах, Polar O Trigonal Planar NO, Trigonal Planar :-1 0=0 AX, E, I 1 non polar - 30 80/0=N-O HO Tetrahedral and Bent AX₂E₂ HO 0 0 I Polar 86 O Page 3 of 7
are these answers correct?

Answer 1

Yes, valence electron of CH4,​​ NH3 and H2O are 8 but NO3- has 24 valence electron. Nitrogen have 5, Oxygen have 6 valence electron so overall valence electron for NO3- is 5+6(3) +1= 24

Electron domen geometry of CH4 is tetrahedral not trigonal pyramidal and other three are right.

The bond angle of H2O is 104.5 instead of 109.5 other bond angle data are right.

Molecular shape designation of NH3 is AX3E, and NO3- is AX3, and shape designation of CH4 and H2O are right.

Formal charge of NO3- has two oxygen =-1, rest one oxygen=0 and Nitrogen =+1 formal charge and other three molecule are right formal charge.

Polar non polar part of the 4 molecule are right.