Unit: Chemical Quantities
Volume Conversions with the Mole
After today, you will 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)
Mole  Volume Conversions
For one mole of any gas at STP,
the volume occupied will be
22.4 liters.
1 mole gas = 22.4 L gas
STP = standard temperature and pressure
= 0 degrees Celsius and 1 atmosphere
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 x
1
1 mol He
22.4 L He
.
=
6.665 mol He
2-Step Conversions with Volume,
Mass, and Particles
We have already learned…
How to convert moles into particles and vice versa
by using the conversion factor…
1 mole = 6.02x1023 atoms, 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
All Roads Lead to the Mole
# of liters
1 mole = 22.4 Liters
1 mole = 6.02 x 1023 particles
MOLE
# of particles
(atoms,
molecules or
formula units)
1 mole = (Molar Mass) grams
# of grams
Example: What volume would
4.32x1023 atoms of Krypton gas
occupy at STP?
K: 4.32x1023 atoms Kr
U: ? L Kr
4.32x1023 atoms Kr x
1 mol Kr
x
6.02x1023 atoms Kr
1
.
22.4 L Kr
1 mol Kr
16.1 L Kr
.
=
.
Time to Practice!
Complete WS 4