Determine the electron and molecular geometries of each

Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo Tro

Problem 69P Chapter 10

Introductory Chemistry | 5th Edition

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Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo Tro

Introductory Chemistry | 5th Edition

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Problem 69P

PROBLEM 69P

Determine the electron and molecular geometries of each molecule.

(a) N2O (oxygen is terminal)

(b) SO2

(c) H2S

(d) PF3

Step-by-Step Solution:
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Solution 69P

Here, we are going to find out electron and molecular geometries of each molecule.The bond angles can be calculated by using VSEPR theory. The repulsion between the electron groups of the internal atom determines the geometry of the molecule. The best possible geometry of the molecule is that where electron groups have maximum separation between them. The VSEPR notation for a molecule is as follows

 AXn, where "A" and n represents central atom and the number of bonds with the central atom respectively.

When lone pair of electrons are present in a molecule, then the VSEPR notation will be  AXnEn, where En is the number of lone pair of electrons present on the central atom.,

Electron group geometry depends on the number of electron groups around the central atom.

Molecular geometry of the molecule can be determined by electron groups as well lone pair of electrons.

(a) N2O (oxygen is terminal)

The valence electron of N = 5

Valence electron of O atom = 6

Total valence electrons in N2O molecule = 6+2x5 =16 e

The Lewis structure of N2O is

From Lewis structure,N2O has two  bonding electron groups at the central atom and it has no lone pair of electrons on the central atom.

Bonding groups = 2

Lone pair of electrons on central atom = 0

Thus,  electron group geometry and molecular geometry of N2O  is = Linear

The bond angle is 180o.

(b) SO2

The valence electron of S = 6

Valence electron of O atom = 6

Total valence electrons in N2O molecule = 6+2x6 =18 e

The Lewis structure of SO2 is

From Lewis structure, SO2 has two  bonding electron groups at the central atom and it has one lone pair of electrons on the central atom.

Thus,  electron group geometry = Trigonal planar

and molecular geometry of SO2  is = Bent

(c) H2S

The valence electron of H = 1

Valence electron of S atom = 6

Total valence electrons in H2S molecule =2 +6 =8 e

The Lewis structure of H2S is

 

From...

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Chapter 10, Problem 69P is Solved
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Textbook: Introductory Chemistry
Edition: 5
Author: Nivaldo Tro
ISBN: 9780321910295

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