DDD

1. 1
Chapter 10
Chemical Quantities
10.2
The Mole
Copyright © 2008 by Pearson Education, Inc.
Publishing as Benjamin Cummings

2. Section 10.1
The Mole: A Measurement of
Matter
 OBJECTIVES:
Describe methods of
measuring the amount
of something.

3. Section 10.1
The Mole: A Measurement of
Matter
 OBJECTIVES:
Define Avogadro’s
number as it relates to
a mole of a substance.

4. Section 10.1
The Mole: A Measurement of
Matter
 OBJECTIVES:
Distinguish between
the atomic mass of an
element and its molar
mass.

5. Section 10.1
The Mole: A Measurement of
Matter
 OBJECTIVES:
Describe how the
mass of a mole of a
compound is
calculated.

6. 6
Collection Terms
A collection term states a specific number of items.
• 1 dozen donuts = 12 donuts
• 1 ream of paper = 500 sheets
• 1 case = 24 cans
Copyright © 2008 by Pearson Education, Inc.
Publishing as Benjamin Cummings

7. 7
A mole (mol) is a collection that contains
• The same number of particles as there are
carbon atoms in 12.01 g of carbon.
• 6.022 x 1023 atoms of an element (Avogadro’s
number).
1 mol C = 6.022 x 1023 C atoms
1 mol CO2 = 6.022 x 1023 CO2 molecules
1 mol NaCl = 6.022 x 1023 NaCl formula units
A Mole of Particles

8. 8
Samples of One Mole
Quantities
Table 6.1
Copyright © 2008 by Pearson Education, Inc. Publishing as Benjamin Cummings

9. 9
Using Avogadro’s Number
Avogadro’s number
• Converts moles of a substance to
the number of particles.
• Converts particles of a substance to
moles.
Copyright © 2008 by Pearson Education, Inc.
Publishing as Benjamin Cummings

10. 10
Subscripts and Moles
The subscripts in a formula state
• The relationship of atoms in the formula.
• The moles of each element in 1 mol of
compound.
Glucose
C6H12O6
In 1 molecule: 6 atoms C 12 atoms H 6 atoms O
In 1 mol: 6 mol C 12 mol H 6 mol O

11. 11
Subscripts State Atoms and
Moles
1 mol C9H8O4 = 9 mol C 8 mol H 4 mol O
Copyright © 2008 by Pearson Education, Inc.
Publishing as Benjamin Cummings

12. 12
Learning Check
A. How many moles O are in 0.150 mol aspirin
C9H8O4?
B. How many O atoms are in 0.150 mol aspirin
C9H8O4?

13. 13
Solution
A. How many mol O are in 0.150 mol aspirin C9H8O4?
0.150 mol C9H8O4 x 4 mol O = 0.600 mol O
1 mol C9H8O4
subscript factor
B. How many O atoms are in 0.150 mol aspirin C9H8O4?
0.150 mol C9H8O4 x 4 mol O x 6.022 x 1023 O atoms
1 mol C9H8O4 1 mol O
subscript Avogadro’s
factor Number
= 3.61 x 1023 O atoms

14. 14
Learning Check
How many O atoms are in 0.150 mol aspirin C9H8O4?

15. 15
Solution
How many O atoms are in 0.150 mol aspirin C9H8O4?
0.150 mol C9H8O4 x 4 mol O x 6.022 x 1023 O atoms
1 mol C9H8O4 1 mol O
subscript Avogadro’s
factor number
= 3.61 x 1023 O atoms