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Unit: Chemical Quantities

Day 4 - Notes

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)

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

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 mol He .

x

6.665 mol He

=

22.4 L He

1

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

1 mol Kr .

22.4 L Kr .

x

x

=

6.02x1023 atoms Kr

1 mol Kr.

1

16.1 L Kr

HOMEWORK:

Time to Practice!Complete WS 4