Question

Determine the geometries using vsepr theory .State the approximate bond angle(s) in each molecule and determine whether each molecule is polar or non polar a)BCl3 b)PCl5 c)NCl3 d)SO3 e)XeF4 f)HBF2?

Answer 1

See below

Explanation:

a) `"BCl"_3`

We leave it as an exercise for the student to do this one.

b) `"PCl"_5`

Another exercise, but here's a link to the structure of `"PBr"_5` to help you.

c) `"NCl"_3`

(i) Lewis structure

https://cluster13-files.instructure.com/courses/986898/files/31116480/course%20files/003%20Chapter%209%20Chemical%20Bonding%20I%3A%20%20Lewis%20Theory/Electron%20Dot%20Structures/07048%20bbluejpg
(from usflearn.instructure.com)

This is an `"AX"_3"E"` molecule.

(ii) Shape — Trigonal pyramid

http://file2.answcdn.com/answ-cld/image/upload/h_320,c_fill,g_face:center,q_60,f_jpg/v1401098305/ql7oh2p4szvm3yphhcp5png
(from www.answers.com)

(iii) Bond angles — slightly less than 109.5°

(iv) Polarity — polar

(d) `"SO"_3`

(i) Lewis structure

(from gallery4share.com)

This is an `"AX"_3` system.

(ii) Shape — Trigonal planar

http://glencoe.mcgraw-hill.com/sites/dl/free/007874637x/514757/trigonal_planarjpg
(from www.suggestkeyword.com)

(iii) Bond angles — 120°

(iv) Polarity — nonpolar

All bond dipoles cancel, therefore

e) `"XeF"_4`

(i) Lewis structure

http://images.tutorvista.com/cms/images/101/lewis-dot-structure-of-xef4png
(from chemistry.tutorvista.com)

This is an `"AX"_4"E"_2` structure.

(ii) Shape — square planar

(iii) Bond angles — 90°

(iv) Polarity — nonpolar

f) `"HBF"_2`

(i) Lewis structure

(from www.uwplatt.edu)

This is an `"AX"_3` structure.

(ii) Shape — Trigonal planar

(iii) Bond angles — Approximately 120°.

(iv) Polarity — polar