Premium Essay

News

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Submitted By MinNguyen
Words 20207
Pages 81
10

CHAPTER

SOLUTIONS MANUAL

The Mole
Section 10.1 Measuring Matter page 320–324

b. 2.50 ϫ 1020 atoms Fe
2.50 ؋ 1020 atoms Fe ؋

Practice Problems

‫؋ 51.4 ؍‬

10؊4

1 mol Fe
__

6.02 ؋ 1023 atoms Fe

mol Fe

pages 323–324

1. Zinc (Zn) is used to form a corrosion-inhibiting

surface on galvanized steel. Determine the number of Zn atoms in 2.50 mol of Zn.
2.50 mol Zn ؋
‫4201 ؋ 15.1 ؍‬

___

6.02 ؋ 1023 atoms Zn
1 mol Zn atoms of Zn

2. Calculate the number of molecules in 11.5 mol

of water (H2O).
11.5 mol H O ؋ ___
6.02 ؋ 1023 molecules H2O

2

‫؋ 29.6 ؍‬

1024

1 mol H2O molecules of H2O

3. Silver nitrate (AgNO3) is used to make several

Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc.

different silver halides used in photographic films. How many formula units of AgNO3 are there in 3.25 mol AgNO3?
3.25 mol AgNO3 ؋
‫4201 ؋ 69.1 ؍‬

____

6.02 ؋ 1023 formula units AgNO3

1 mol AgNO3 formula units of AgNO3

4. Challenge Calculate the number of oxygen

atoms in 5.0 mol of oxygen molecules. Oxygen is a diatomic molecule, O2.
5.00 mol O2 ؋

___

6.02 ؋ 1023 molecules O2
1 mol O2

2 O atoms
؋ __ ‫01 ؋ 20.6 ؍‬

24

molecule O2

atoms O

5. How many moles contain each of the

following?
a. 5.75 ϫ 1024 atoms Al

for each formula and convert the given number of representative particles to moles.
a. 3.75 ϩ 1024 CO2
The representative particle is a molecule.
3.75 ؋ 1024 molecules CO2
1 mol CO2
؋
‫ 32.6 ؍‬mol CO2
6.02 ؋ 1023 molecules CO2

___

b. 3.58 ϫ 1023 ZnCl2

The representative particle is a formula unit.
3.58 ؋ 1023 formula units ZnCl2
1 mol ZnCl2
؋
6.02 ؋ 1023 formula units ZnCl2
‫ 595.0 ؍‬mol ZnCl2

___

Section 10.1 Assessment page 324

7. Explain why chemists use the mole.
Chemists use the mole because it is a

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