1. The Ideal Gas Law

2. Review Recall the equation of the constant (k) for each law: Boyles Lawk B = PV Gay-Lussacs Lawk G = P/T Charless Lawk C = V/T Avogadros Lawk A = V/n

3. Review Recall the equation of the constant (k) for each law: Boyles Lawk B = PV Gay-Lussacs Lawk G = P/T Charless Lawk C = V/T Avogadros Lawk A = V/n Combine the four constants …

4. A New Constant Emerges Recall the equation of the constant (k) for each law: Boyles Lawk B = PV Gay-Lussacs Lawk G = P/T Charless Lawk C = V/T Avogadros Lawk A = V/n PV nT

5. The Ideal Gas Constant The Ideal Gas Constant has the symbol R R = PV nT

6. The Ideal Gas Equation The Ideal Gas Constant has the symbol R R = Rearranging this gives the Ideal Gas Law: PV = nRT PV nT

7. The Ideal Gas Equation The Ideal Gas Constant has the symbol R R = Rearranging this gives the Ideal Gas Law: PV = nRT PV nT pressure volume moles constant temperature

8. The Ideal Gas Equation The Ideal Gas Constant has the symbol R R = Rearranging this gives the Ideal Gas Law: PV = nRT R = 8.314kPa L mol K PV nT

9. The Ideal Gas Equation The Ideal Gas Constant has the symbol R R = Rearranging this gives the Ideal Gas Law: PV = nRT R = 8.314kPa L mol K PV nT NOTE: When using this value for R, Pressure must be in kPa, Volume must be in L, and Temperature must be in Kelvin.

10. Example 1) Calculate the pressure of 0.412 mol of He gas at 16.0°C occupying 3.25 L. On board

11. Example 2) When 2.50 g of ethanol, C 2 H 6 O, is vaporized, the vapour is found to have a pressure of 100.2 kPa. The volume of the container is 1.68 L and the temperature is 100°C. What is the molar mass of the ethanol? Hint – Molar mass is the mass in gs of 1 mol of a substance.

12. What is an Ideal gas? They dont exist!!!

13. What is an Ideal gas? They dont exist!!! An ideal gas is a model for gas behavior that follows the Kinetic Molecular Theory - gas particles are in constant movement - collisions btwn particles and with the container are elastic - there are no attractive or repulsive forces btwn the particles of a gas - do not condense into liquids when cooled

14. The Bottom Line At ordinary conditions, most gases behave ideally and obey the gas laws