   # Find the number of moles of oxygen in each of the following: a . 0 .35 mol N 2 O 4 b . 2 .26 mol CO 2 c . 1 .55 mol CO d . 42 .7 g 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 43E
Textbook Problem
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## Find the number of moles of oxygen in each of the following: a . 0 .35 mol N 2 O 4 b . 2 .26 mol CO 2 c . 1 .55 mol CO d . 42 .7 g H 2 O

Interpretation Introduction

Interpretation:

The number of moles of oxygen is to be determined in the given molecules.

Concept Introduction:

The characteristic mass of a compound is considered as the formula mass of the compound, which is obtained by adding the atomic masses of all the atoms.

A conversion factor is considered a numerical ratio in order to change one unit into another.

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

### Explanation of Solution

a) 0.35mol N2O4

The equivalence is obtained between moles of N2O4 and moles of oxygen with the help of the chemical formula as follows:

4mol O1mol N2O4

In order to obtain moles of oxygen, the conversion factor proceeds as follows:

(0.35mol N2O4)×(4mol O1mol N2O4)=1.4mol O

Therefore, the moles of oxygen are 1.4 mol.

b) 2.26mol CO2

The equivalence is obtained between moles of CO2 and moles of oxygen with the help of the chemical formula as follows:

2mol O1mol CO2

In order to obtain moles of oxygen, the conversion factor proceeds as follows:

(2.26mol CO2)×(2mol O1mol CO2)=4.52mol O

Therefore, the moles of oxygen are 4.52 mol.

c) 1.55mol CO

The equivalence is obtained between moles of CO and moles of oxygen with the help of the chemical formula as follows:

1mol O1mol CO

In order to obtain moles of oxygen, the conversion factor proceeds as follows:

(1

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