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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.

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Presentation on theme: "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."— Presentation transcript:

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 and do text HW for Thursday. 1

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


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