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?