   # Balancing Chemical Equations Balance each chemical equation: a . HCl + O 2 → H 2 O + Cl 2 b . NO 2 + H 2 O → HNO 3 + NO c . CH 4 + O 2 → CO 2 + H 2 O ### Chemistry In Focus

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

#### Solutions

Chapter
Section ### Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 4, Problem 49E
Textbook Problem
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## Balancing Chemical EquationsBalance each chemical equation: a . HCl + O 2   → H 2 O + Cl 2 b . NO 2 + H 2 O  → HNO 3 + NO c . CH 4 + O 2   → CO 2 + H 2 O

Interpretation Introduction

Interpretation:

The chemical equations are to be balanced for the given reactions.

Concept introduction:

A chemical equation is a symbolic depiction of a chemical reaction that contains symbols and formula.

In a chemical reaction, the starting substances on the left side are known as reactants, while the substances on the right side are known as products.

The chemical formula represents the precise number of atoms in a molecule, but not their structural arrangement.

### Explanation of Solution

a) HCl+O2H2O+Cl2

H atom is balanced first, because it occurs in only one compound on each side of the equation as follows:

2HCl+O2H2O+Cl2

In the next step, O atom is balanced by multiplying the coefficient 1/2 with O2 as follows:

2HCl+12O2H2O+Cl2

Now, the equation is technically balanced, however multiply both the sides of the equation by 2 in order to clear coefficient fractions, such as 1/2, as follows:

[2HCl+12O2H2O+Cl2]×2

So, the balanced equation can be represented as follows:

4HCl+O22H2O+2Cl2

b) NO2+H2OHNO3+NO

H atom is balanced first, because it occurs in only one compound on each side of the equation as follows:

NO2+H2O2

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