Chemical Quantities and the Mole

Copyright © 2011 - MsRazz ChemClass

Volume Conversions with the Mole

Unit: Chemical Quantities

Copyright © 2011 - MsRazz ChemClass

After today, you should be able to…

• Calculate the volume of a gas

at STP given the number of
moles and vice versa

• Perform two step volume

conversions (Ex: atoms to
liters)

Copyright © 2011 - MsRazz ChemClass

Mole  Volume Conversions

For one mole of any gas at
STP, the volume occupied will
be 22.4 liters.

STP = standard temperature and pressure

= 0 degrees Celsius and 1 atmosphere

1 mole gas = 22.4 L gas

Multiple Choice

What does STP stand for in chemistry?

• Standard Temperature Point
• Systematic Temperature Process
• Scientific Thermal Principle
• Standard Temperature and Pressure

Multiple Choice

What is the volume occupied by one mole of any gas at STP?

• 22.4 liters
• 25.4 liters
• 20.4 liters
• 24.4 liters

Copyright © 2011 - MsRazz ChemClass

Example: How many moles of
Helium gas will occupy a volume of
149.3L at STP?

K: 149.3L He
U: ? mol He

149.3 L He

1

x
22.4 L He
1 mol He
=

6.665 mol He

Copyright © 2011 - MsRazz ChemClass

We have already learned…

How to convert moles into particles and vice
versa by using the conversion factor…
1 mole = 6.02x1023atoms, molec. or F.U.

How to convert moles into grams and vice versa
by using the conversion factor…

1 mole = atomic mass in grams

How to convert moles into liters and vice versa by
using the conversion factor…

1 mole = 22.4 L

Copyright © 2011 - MsRazz ChemClass

PARTICLES

VOLUME

1 mole =

6.02x10

23

atoms,

6.02x10

23

molecules,

6.02x10

23

formula units

Copyright © 2011 - MsRazz ChemClass

Example: What volume would
4.32x1023atoms of Krypton gas
occupy at STP?

K: 4.32x1023atoms Kr
U: ? L Kr

4.32x1023 atoms Kr

1

x

6.02x1023 atoms Kr

1 mol Kr .

=

16.1 L Kr

x 22.4 L Kr .

1 mol Kr

Multiple Choice

How many atoms, molecules, or formula units are there in 1 mole?

• 4.022 x 10^23
• 7.022 x 10^23
• 6.022 x 10^23
• 5.022 x 10^23

Copyright © 2011 - MsRazz ChemClass

Time to Practice!

Complete WS4