CHEM:ATOM FOC 2E CL (TEXT)
CHEM:ATOM FOC 2E CL (TEXT)
2nd Edition
ISBN: 9780393284218
Author: Stacey Lowery Bretz, Natalie Foster, Thomas R. Gilbert, Rein V. Kirss
Publisher: WW Norton & Co
Question
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Chapter 2, Problem 2.77QA
Interpretation Introduction

To find:

Which substance contains more moles of oxygen?

Expert Solution & Answer
Check Mark

Answer to Problem 2.77QA

Solution:

a) Both contain same mol of O.

b) N2O4

c) CO2.

Explanation of Solution

Calculations:

A mole is the SI unit of amount chemical substance. When writing units, it is written as “mol”.

a) 1  mol Al2O3 or 1  mol of Fe2O3

In one molecule of Al2O3, there are three atoms of oxygen. So we can say, the mole ratio between Al2O3 and O is 1:3. Now we have the mole to mole ratio and moles of Al2O3 so we can calculate the moles of oxygen by using dimensional analysis as below,

1 mol of Al2O3×3 mol of O1 mol of Al2O3=3 mol of O

In one molecule of Fe2O3, there are three atoms of oxygen. So we can say, the mole ratio between Fe2O3 and O is 1:3. Now we have the mole to mole ratio and moles of Fe2O3 so we can calculate the moles of oxygen by using dimensional analysis as below,

1 mol of Fe2O3×3 mol of O1 mol of Fe2O3=3 mol of O

So 1 mole Al2O3 and 1  mole of Fe2O3 both contains same 3  moles of oxygen

b) 1 mol of SiO2 or  1  mol N2O4.

In one molecule of SiO2, there are two atoms of oxygen. So we can say, the mole ratio between SiO2 and O is 1:2. Now we have the mole to mole ratio and moles of SiO2 so we can calculate the moles of oxygen by using dimensional analysis as below,

1 mol of SiO2×2 mol of O1 mol of SiO2=2 mol of O

In one molecule of N2O4, there are four atoms of oxygen. So we can say, the mole ratio between N2O4 and O is 1:4. Now we have the mole to mole ratio and moles of N2O4 so we can calculate the moles of oxygen by using dimensional analysis as below,

1 mol of N2O4×4 mol of O 1 mol of N2O4=4 mol of O

So 1  mole of N2O4 contains more moles of oxygen than  1  mole SiO2.

c) 3  mol of CO or 2  mol of CO2.

In one molecule of CO, there is one atom of oxygen. So we can say, the mole ratio between CO and O is 1:1. Now we have the mole to mole ratio and moles of CO so we can calculate the moles of oxygen by using dimensional analysis as below,

3 mol of CO×1 mol of O 1 mol of CO=3 mol of O

In one molecule of CO2, there are two atoms of oxygen. So we can say, the mole ratio between CO2 and O is 1:2. Now we have the mole to mole ratio and moles of CO2 so we can calculate the moles of oxygen by using dimensional analysis as below,

2 mol of CO2×2 mol of O1 mol of CO2=4 mol of O

So, 2  mole of CO2 contains more number of moles of oxygen than  3  moles of CO.

Conclusion:

The number of moles of the oxygen calculated from the number of moles of compounds and mole ratio between them.

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Chapter 2 Solutions

CHEM:ATOM FOC 2E CL (TEXT)

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