1. Molar Volume

2. Do you have mole problems? If so, call Avogadro at 602-1023.

3. Avogadro’s Hypothesis
Equal volumes of different gases, at the same temperature and pressure, contain the same number of particles

4. WHAT? Think, pair, share this idea.
First think to yourself – what does that mean?
Then try to explain it in your own words to your partner, telling them WHY?
Then report out when I call on you.

5. Words to know
Molar volume of a gas is the volume occupied by one mole of the gas
STP = Standard temperature and pressure = OC and 101.3kPa

6. Avogadro’s Interpretation
All gas samples with the same temp, pressure and number of particles occupy identical volumes
Equal number of moles of every gas at STP occupy the same volumes

7. 1 mol of ANY GAS at STP has a volume of 22.4L

8. Molar Volume at STP The molar volume of any gas at STP is 22.4L
Conversion factor (to cancel off the units)
1mol or L
22.4L mol

9. Let’s Review Molar mass (find mass from periodic table) g or 1mol
mol g
Molar volume
1mol or L
22.4L mol

10. This conversion factor only applies to GASES at STP!!!
NOTE:
This conversion factor only applies to GASES at STP!!!

11. Example:
What is the volume occupied by 0.350mol of SO2(g) at STP?

12. Example 2:
How many moles of gas are contained in a balloon with a volume of 10.0L at STP?
#mols =
#molw = 10.0L x 1mol / 22.4L = 0.446mol

13. Example 3:
How many litres at SATP would molecules of HCl fill??

14. Example 4
How many grams does L of CO2 gas weigh?