Question

Date Complete all boxes. Have your instructor initial the boxes after they have checked your model for each molecule/ion. Each Box=0.5 pts. Formula and instructor initials NH₃ CS₂ CHCL₃ C in center SO₃ PF5 Total Valence Electrons 8 24 Lewis Dot Electron Structure Domains H H N. :0: H 6-91 :0: 4 Electron Geometry Tetrahedral Molecular Hybrid- Geometry ization Trigonal Pyramidal Trigonal Pyramidal sp³ Is the molecule polar? Yes NO

Answer 1

NH3 has a total of 8 valence electrons, leading to a trigonal pyramidal geometry according to the VSEPR model. The asymmetrical distribution of electrons and difference in electronegativity between N and H atoms make ammonia a polar molecule.

Step-by-step explanation:

To determine whether the molecule NH3 (ammonia) is polar, we start by calculating the number of valence electrons. For NH3, we have one nitrogen atom with 5 valence electrons and three hydrogen atoms each contributing one, totaling 8 valence electrons. Next, we draw the Lewis structure, placing the nitrogen at the center with three hydrogen atoms surrounding it, each bonded by a single bond, and the nitrogen carrying one lone pair of electrons.

Considering the VSEPR model, NH3 has four electron domains (three bonding pairs and one lone pair). This leads to a trigonal pyramidal geometry, derived from a tetrahedral electron geometry but altered due to the lone pair which influences the molecular shape. Lastly, due to the asymmetrical distribution of electrons and the difference in electronegativity between nitrogen and hydrogen, NH3 is indeed a polar molecule.