CHEM 1110 1st Edition Lecture 16Outline of Last Lecture I. Gas Law Applications II. Gas Mixtures III. Kinetic-Molecular Theory Outline of Current Lecture I. Gas Movement in a SystemII. Non-ideal Gas Behavior Current LectureI. Gas Movement in a System A. Diffusion- net path of gasB. Effusion (through pinhole)1. Both gases effuse through pores in balloon, but lighter helium gas effuses faster than heavier argon gas2. The difference in rates of effusion for helium and nitrogen, for example, explains why a helium balloon would deflate fasterC. Root Mean Square Speed (rms)1. Mean or average (Uavg)2. Most probable speed (Ump)3. Rns speed (Urms)a. Is the speed of a molecule possessing a kinetic energy identical to the average kinetic energy of the sample i. Eaverage= 1/2m(Urns)2D. Graham’s Law of Effusion These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.1. The effusion rate of gas is inversely proportional to the square root of its molar mass a. Only those molecules that hit the small hole will escape through it. Therefore, the high the U the greater the probability of a gas molecule hitting the hole II. Non-ideal Gas Behavior A. Van Der Walls equation: (P+(n2a/V2)(V-nb)=nRt1. Ne: a=.211 b=.07112. Ag: a=1.34 b=.03223. Kr: a=2.32 b=.02984.Xe: a= 4.19
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