230_Sp10_L04_post-1(1)

230_Sp10_L04_post-1(1) - CHEM 230 Sp10 Lecture 4 Chapter 4:...

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CHEM 230 Sp10 Lecture 4 Chapter 4: Gases 1) Kinetic Theory 2) Non-ideal 3) Putting it all together Session ID: 230
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Concept Question A sealed, heavily insulated, rigid gas cylinder has a Maxwell-Boltzmann distribution of B. After opening the cylinder and allowing a slow venting of gas, which distribution is most likely? A B C 0 500 1000 1500 2000 2500 3000 Speed (m/s) Number of molecules B A C
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Concept Question A sealed, heavily insulated, rigid gas cylinder has a Maxwell-Boltzmann distribution of B. After opening the cylinder and allowing a slow venting of gas, which distribution is most likely? A B C 0 500 1000 1500 2000 2500 3000 Speed (m/s) Number of molecules B A C
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Assumptions we have been making (Kinetic Theory) Reality Check (Non-ideal gases) Practice problems
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Kinetic Theory of Gases: Assumptions 1. Gas consists of a collection of molecules in continuous random motion. 2. The molecules move in straight lines until they collide. 3. *The molecules do not influence one another except during collisions. (i.e., they do not attract or repel). 4. *Gas molecules are infinitesimally small points.
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Nitrogen at different T http://www.chem.ufl.edu/~itl/2045/lectures/lec_e.html Ideal: high temperature and low pressure
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Deviation from Ideality at “low” T Molar Volume @ 0 o C and 1 atm Gas Molar Volume (L/mol) Condensation point ( o C) He 22.435 -268.9 H 2 22.432 -252.8 Ne 22.422 -246.1 Ideal 22.414 None Ar 22.397 -185.9 N 2 22.396 -195.8 O 2 22.390 -183.0 CO 22.388 -191.5 Cl 2 22.184 -34.0 NH 3 22.079 -33.4
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Deviation from Ideality with P • Moderate pressure: intermolecular attractions cause decrease in molar volume – Note @ low T, molecules exert force on one another longer; leads to condensation • High pressure: molecules occupy most of volume in container; gas not as compressible so volume of container particles occupy is higher than that of an ideal gas
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This note was uploaded on 01/24/2012 for the course PCHEM 230 taught by Professor Gottfried during the Fall '11 term at University of Michigan.

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230_Sp10_L04_post-1(1) - CHEM 230 Sp10 Lecture 4 Chapter 4:...

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