1. Molar Volume
of a Gas at
STP
Lesson 2

2. It binds to receptors in the brain and causes nerve activity to slow down
Adenonsine is produced by the brain
This makes you tired
Caffeine binds to the same receptors but does not slow down the nerve activity

3. The molar volume of any gas a STP standard temperature (0 0C) and pressure (101 kPa) is 22.4 L.
memorize!
1 mole
1. Calculate the volume of 10.0 lbs of CO2 at STP.
10.0 lbs
x kg
x g
x 1 mole
x L
= x 103 L
2.21 lbs
1 kg
44.0 g
1 mole

4. 2. Calculate the volume of O2 gas produced at STP for the
2. Calculate the volume of O2 gas produced at STP for the complete decomposition of 12.5 g HgO.
HgO → 2Hg O2 2 1
12.5 g
? L
12.5 g HgO
x 1mole
x 1 mole O2
x L
= L
216.6g
2 mole HgO
1 mole

5. 3. 10. 62 g of a common gas occupies 8. 50 L at STP. Calculate
g of a common gas occupies 8.50 L at STP. Calculate the molar mass of the gas and determine the gas.
8.50 L
x 1 mole
= moles
22.4 L
grams
Molar Mass =
= g
moles
moles
= g/mole
The gas is N2