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Lecture #11

# Lecture #11 - Chemistry 2A-c W2009(Ch6-5)76 III...

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Chemistry 2A Chemistry 2A -c W2009 c W2009 (Ch6 (Ch6 -5)76 5)76 Ideal gas equation: PV=nRT For fixed n: Ideal gas assumes very large distance between molecules (low density). Thus, no inter-molecular force exists between molecules. Valid at high T and low P. Gases are real and under conditions of low T and high P, gases have a high density and are expected to deviate from the ideal gas law. In such cases, the intermolecular forces between molecules can no longer be ignored. 2 2 2 1 1 1 T V P T V P = III. Applications of Ideal Gas Equation Example : An aerosol can at 1.5 atm and 25 o C. What is the pressure when heated to 450 o C? Use the equation,P 1 V 1 T 2 =P 2 V 2 T 1 Because V 1 = V 2 , we have: (1.5 atm) (723K) =(P 2 ) (298K) P 2 = 3.6 atm

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Chemistry 2A Chemistry 2A -c W2009 c W2009 (Ch6 (Ch6 -6)77 6)77 The volume of a gas is proportional to the number of molecules of gas in the sample. The proportion of reactant gases by volume is the same as the proportion of reactant gas molecules. When measured at the same pressure and temperature, the volume of a gas reactants and products are in ratios of simple whole numbers. Example: H 2 (g) + Cl 2 (g) 2 HCl (g) Stoichiometric (mol) ratio = volume ratio 2.5 L 2.5 L 5.0 L 1 : 1 : 2 = 1 : 1 : 2 3 H 2 (g)+ N 2 (g) 2NH 3 (g) Stoichiometric (mol) ratio = volume ratio 7.5 L 2.5 L 5.0 L 3 : 1: 2 = 3: 1 : 2
Chemistry 2A Chemistry 2A -c W2009 c W2009 (Ch6

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Lecture #11 - Chemistry 2A-c W2009(Ch6-5)76 III...

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