Mole Conversions

1
Chapter 8

• Mole Conversions
• Part 2

2
3.2 Molecular Mass/Weight Formula Mass/Weight

• The formula of an Acetylsalicylic Acid (Aspirin)
  molecule is C9H8O4
• Acetylsalicylic Acid (Aspirin) has molar mass of
  180.159 g/mol
• How many hydrogen atoms are contained in a 0.372
  g tablet?

3
0.372g C9H8O4
4
0.372g C9H8O4 mol
180.159 g
5
0.372g C9H8O4 mol 6.02 x
1023 molecules
180.159 g mol
6
0.372g C9H8O4 mol 6.02 x
1023 molecules 8 H atoms
180.159 g mol
molecule
7
0.372g C9H8O4 mol 6.02 x
1023 molecules 8 H atoms
180.159 g mol
molecule
9.94 x 1021 H atoms
8
What is the mass in grams of one atom of carbon?
9
What is the mass in grams of one atom of carbon?
12.0 g/mol
10
What is the mass in grams of one atom of carbon?
12.0 g
mol
11
What is the mass in grams of one atom of carbon?
12.0 g mol
1.99 x 10-23 g/atom
mol 6.02 x 1023 atoms
12
What is the mass in grams of one molecule of
water?
13
What is the mass in grams of one molecule of
water?
18.0 g
mol
14
What is the mass in grams of one molecule of
water?
18.0 g mol
2.99 x 10-23 g/molecule
mol 6.02 x 1023 molecules
15
Information for Upcoming Mole Quiz

• How does a mole relate to particles and mass?
  (example One mole of H2O is 6.02 x 1023 H2O
  molecules and has a mass of 18g).
• Be able to use this information in factor-label
  problems.
• Know how to determine the number of atoms in a
  molecule. Be able to use this information in
  factor-label problems.
• Be able to determine the number of
  grams/molecule.
• Identify the diatomic gases.
• Do metric conversions.

16
Homework

• Mole Worksheet (1-20)
• Notice that answers are provided for this
  worksheet in your notebook.