Another Look: an addition to the combined law Avocado's Law?
No silly Chem-Puter! Avogadro's Law!
V₁ = V₂ n₁ n₂
Analyzing meaning of symbols…..
So what does Avogadro's law tell us?
-In your groups interpret the relationship between volume and moles.
So what does Avogadro's law tell us?
-In your groups interpret the relationship between volume and moles.
- Now, figure out a way to put this into the combined gas law- Each group member will need to write down their conclusions to turn in.
Is this what you got?
P₁V₁ = P₂V₂ T₁ n₁ T₂ n₂
Lets try this out• A balloon with a volume of 220mL is filled
with 2.0 moles helium. To what volume will the balloon expand if 3.0 moles helium are added, to give a total of 5.0 moles Helium (the pressure and temperature do not change)?
GivenV₁ = 220mL V₂= ?n₁ = 2.0moles n₂= 5.0 moles
Compu-Com
STP and Molar Volume
STP = Standard Temperature and Pressure
T= 273 K
P= 1atm
On your sheets to turn in, convert these to torr and ⁰C
What can we do with STP?
• We can use STP to make conversions between moles and volume– 1 mole of gas at STP=22.4L– This is called molar volume
Draw these in your groups
One from each of you for
further analysis
1. What happens to the volume of a bicycle tire or a basketball when you use an air pump to add air
2. What happens when you blow up a balloon and release it
3. What happens in your lungs when you breathe in air? What happens when you breathe out air?