1. Homework Check (Gay-Lussac’s Law) 1.The pressure in a car tire is 1.88 atm at 25.0 ⁰C. What will be the pressure if the temperature increases to 37.0 ⁰C? 2.The pressure of the Oxygen gas inside a canister is 5.00 atm at 25.0 ⁰C. The canister is located at a camp high on Mount Everest. If the temperature there falls to –10.0 ⁰C, what is the new pressure inside the canister? 3.Helium gas in a 2.00 L cylinder is under 1.12 atm pressure. At 36.5 ⁰C, that same gas sample has a pressure of 2.56 atm. What was the initial temperature (in Kelvin) of the gas in the cylinder?

2. Combined Gas Law P - V - T

3. Review 3 Gas Laws Watch a Video!

4. Combined Gas Law Boyle’s Law Charles’s Law Gay-Lussac’s Law

5. Examples 1.A balloon with Helium gas has a volume of 50 L at 25 ⁰C and a pressure of 1.08 atm. What volume will it have at 0.855 atm and 10 ⁰C? 2.If I have 17 L of gas at a temperature of 67 ⁰C and a pressure of 88.89 atm, what will be the pressure of the gas if I raise the temperature to 94 ⁰C and decrease the volume to 12 L?

6. Practice! (on a separate piece of paper) 1.If I initially have a gas at a pressure of 12 atm, a volume of 23 L, and a temperature of 200 K, and then I raise the pressure to 14 atm and increase the temperature to 300 K, what is the new volume of the gas? 2.A gas takes up a volume of 17 L, has a pressure of 2.3 atm, and a temperature of 299 K. If I raise the temperature to 350 K and lower the pressure to 1.5 atm, what is the new volume of the gas? 3.A gas that has a volume of 28 L, a temperature of 45 ⁰C, and an unknown pressure has its volume increased to 34 L and its temperature decreased to 35 ⁰C. If I measure the pressure after the change to be 2.0 atm, what was the original pressure of the gas?