1. Chapter 10: Chemical Quantities Mole – Volume Relationships
Mrs. Mansberger

2. Mole – Volume Relationships
The molar volume is used to convert a moles of gas to the volume of the gas at STP.
STP (or standard temperature & pressure) means the temperature is 0°C and a pressure of kPa (or 1 atm)
1 mol = 22.4 L at STP is the conversion factor

3. Calculating the Volume of a Gas at STP
Determine the volume, in liters, of 0.60 mol SO2 gas at STP.
1 mol SO2 = 22.4 L SO2
0.60 mol SO2
22.4 L SO2 =
1 mol SO2
13.44 L SO2
= 13 L SO2

4. Try this with your partner…
What is the volume of 3.70 mol N2 at STP?
1 mol N2 = 22.4 L N2
3.70 mol N2
22.4 L N2 =
1 mol N2
82.88 L N2
= 82.9 L N2

5. Calculating moles of a Gas from volume at STP
At STP, how many moles does 28.0 L of helium contain?
1 mol He = 22.4 L He
28.0 L He
1 mol He =
22.4 L He
1.25 mol He

6. Try this with your partner…
How many moles of carbon dioxide are present in 7.50 liters?
1 mol CO2 = 22.4 L CO2
7.50 L CO2
1 mol CO2 =
22.4 L CO2
mol CO2
= mol CO2