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Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692

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BuyFindarrow_forward

Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 5, Problem 26E
Textbook Problem
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What is wrong with each Lewis structure? Fix the problem and write a correct Lewis structure.

Chapter 5, Problem 26E, What is wrong with each Lewis structure? Fix the problem and write a correct Lewis structure.

Interpretation Introduction

Interpretation:

The reasons for wrong Lewis structures are to be found. The error to be fixed and the correct Lewis structure for each of the given compounds are to be determined

Concept Introduction:

The steps for drawing the Lewis structures of ionic compounds are as follows:

The Lewis structures of elements are combined to form the Lewis structures of compounds.

The dots are transferred from the Lewis structure of the metal to the Lewis structure of the non-metal.

The metal becomes a cation and the non-metal becomes an anion.

According to the Lewis theory, in covalent bonding, atoms share their electrons. The steps for drawing a covalent Lewis structure are as follows:

Write the skeletal structure of the molecule.

Add the number of valence electrons of each atom in the molecule in order to calculate the total number of electrons in the molecule.

Place the electrons by dots to complete the octets of the atoms.

If the central atom has not obtained an octet, then its multiple bonds can be formed.

Explanation of Solution

a)

The given compound is a covalent compound and the electrons are shared between the atoms. Nitrogen is the central atom.

Now, determine the total number of electrons for the molecule.

Total electrons = valence electrons for N + valence electrons for O= 2(5)+6= 16

These electrons are distributed in the structure, to complete the octet of each atom. But, in the given molecule, terminal atoms have ten electrons and the total count of electrons is 20.

So, the correct Lewis structure will be as follows:

As all the atoms in the structure have obtained an octet, the structure is complete.

b)

The given compound is a covalent compound.

Sulfur is the central atom and oxygen atoms are arranged around it.

Now, calculate the total number of electrons for the molecule.

Total electrons = valence electrons for O + valence electrons for S= 2(6)+6= 18

These electrons are distributed in the structure to complete the octet for each atom. But, in the given molecule, the central atom S has not obtained the octet.

So, the correct Lewis structure will be as follows:

As all the atoms in the structure have obtained an octet, the structure is complete

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Chapter 5 Solutions

Chemistry In Focus
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