1. 4.3 The Mole and Volume

2. Mole Rules The chemical formula represents a mole of that substance.
One mole of any substance contains 6.02 E 23 particles.
The formula mass, expressed in grams, represents the mass of one mole of that substance.
One mole of any gas, at STP conditions, occupies litres of volume. 2

3. IV. One mole of any gas, at STP conditions, occupies 22
IV. One mole of any gas, at STP conditions, occupies 22.4 litres of volume.
The volume of a gas is usually measured at STP (standard temp. and pressure).
Standard temp is O°C
Standard pressure is 101 kPa
At STP, 1 mole of any gas occupies a volume of 22.4L. This is known as the molar volume of a gas.
Therefore, the conversion factor looks like this:
1 mole = 22.4L

4. Moles to Volume Calculations

5. THE MOLE ROAD MAP
Formula weight (g)
Formula weight (g)

6. THE MOLE ROAD MAP

7. 1. Determine the volume, in litres, of 0
1. Determine the volume, in litres, of 0.600mol of Sulfur dioxide gas at STP.
Given: 0.600mol
Unknown: volume
Conversion Factor: 1mol = 22.4L
Solution:
= 0.600mol x 22.4L = 13.4L of S02
1mol

8. 2. Determine the number of moles in 33.6L of Helium gas.
Given: 33.6L
Unknown: moles
Conversion Factor: 1mol = 22.4L
Solution:
= L x 1mol = 1.50 mol He
22.4L

9. Assignment a) 215.04L 0.5mol 1.12 L 26.88 L a) 4.00L b) 44.6L
c) L
d) L
a) 4.00L
b) 44.6L
c) L
mol
0.80mol
0.016mol
0.672L
0.5mol
1.12 L
26.88 L 9

10. Check Point! What is the volume of 3.23mol of krypton at STP?
A sample of oxygen gas occupies
63.1L at STP. How many moles of
oxygen gas is this?
72.35L
2.82mol

11. Check Point! What is the volume of 0.037mol of Hydrogen gas at STP?
A sample of helium gas occupies 2.31L at STP.
How many moles of helium gas is this?

12. Mixed Mole Problems

13. Mixed Mole Check Point
How many Liters would 1.75 x molecules of oxygen gas at STP occupy?
How many moles of oxygen atoms are in the sample of oxygen gas from #1?
How much would the oxygen atoms from question #2 weigh?
How much would the oxygen gas from question #2 weigh? 13

14. Mixed Mole Check Point #2
How many atoms of hydrogen are there in 8.9 x 10-23g of water molecules?
How many Liters would 3.7 x molecules of CO gas at STP occupy?
How many grams would the CO in #2 weigh? 14