F09_230_L06_pre[1] - CHEM 230 F09 Lecture 6 Chapter 6:...

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Click to edit Master subtitle style CHEM 230 F09 Lecture 6 Chapter 6: Thermodynamics First Law Session ID: 230
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Wrapping up CH 4 Real Gases Assumptions for an ideal gas Real gases differ from a ideal gases van der Waals coefficients
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van der Waals Equation b Correct for assumption that gas particles have no volume a Correct for assumption that gas particles do not attract of repel one another ( 29 nRT = nb V V n a + P nRT = PV - 2
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Correction 1: Volume…b There is a minimum volume for a gas: Vmin min min V = V = T V + P nRT = V then 0, if Vmin depends on n the number of moles b "molar volume" (L mol-1) The volume occupied by a mol of gas particles. nb V nRT = P P nRT = nb V nb + P nRT = V - -
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Correction 2: Attractive Forces…a Attractive forces between particles reduce pressure Particles that tend to associate with each other also collide with the container walls less often van der Waals forces (all particles) Polar molecules (HCl) Hydrogen bonding (H2O or NH3)
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Compression Factor For ideal gases, Z = 1 For Z < 1, Vm is less than expected (compressed) Obj1 2
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Correction 2: Attractive a a measure of force (J m3 mol-2 or L2 atm mol-2) n the number of moles V container volume Square arises because force requires 2 interacting particles This correction is strictly attractive and does not go far enough to account for full charges 2 attraction attraction - V n a = V nRT = P
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van der Waals Equation ( 29 nRT = nb V V n a + P nRT = PV - 2
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Concept Question Which noble gas will deviate most from ideal behavior? A. He B. Ne C. Ar D. Kr E. Xe F. Rn
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Concept Question Which element or compound will deviate most from ideal gas behavior? A. He B. He1+ C. H2O D. Benzene
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Gas A and Gas B are thoroughly mixed 1 g:1 g in a container and reach thermodynamic equilibrium. Gas B has twice the molar mass of Gas A. Which of the following is true? A. Gas B has a greater partial pressure than Gas A
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This note was uploaded on 03/29/2010 for the course CHEMISTRY 230 taught by Professor Gottfried during the Fall '10 term at University of Michigan.

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F09_230_L06_pre[1] - CHEM 230 F09 Lecture 6 Chapter 6:...

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