1. To do 4 th HW assignment due Friday, 2/27, 10 pm. It is open now. 3 rd Quiz Friday, 2/27 in Discussion. Read Chapter 6.1-6.2 and do text HW for Thursday. 1

2. PV/nT for Different Gases (all at 1 atm and 273K) O 2 : 0.082040 Latm/molK N 2 : 0.082059 Latm/molK CO 2 : 0.081538 Latm/molK NH 3 : 0.080875 Latm/molK Ar: 0.082040 Latm/molK 2

3. Kinetic Molecular Theory Gases consist of particles in constant random motion. Temperature is a measure of average kinetic energy. Pressure is due to collisions of gas particles with the container. 3

4. Gas Law Problem You heat 5.00-g of KClO 3. Determine the volume of oxygen gas collected at 1.00 atm and 25°C. KClO 3 (s)  KCl (s) + O 2 (g) 4

5. The Partial Pressure of each Gas in a Mixture of Gases in a Container Depends on the Number of Moles of that Gas

6. KMT (assumptions) Assume gas particles exert no forces on each other. Assume the volume of the individual gas particles is negligible (zero). 6

7. PV/nRT vs. P 7

8. Clicker Question You have two 4.50-L containers at 25°C, one with 1.0 mol helium gas and one with 1.0 mol SF 6 gas. In which container is there a greater pressure? a)The container filled with helium gas. The atoms are faster and hit more often. b)The container filled with SF 6 gas. The molecules are heavier and hit with more force. c)The gases in the containers exert equal pressure. 8