Class Note for CHEM 112 at UMass(46)
Class Note for CHEM 112 at UMass(46)
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This 9 page Class Notes was uploaded by an elite notetaker on Friday February 6, 2015. The Class Notes belongs to a course at University of Massachusetts taught by a professor in Fall. Since its upload, it has received 18 views.
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Date Created: 02/06/15
Turn on Camtasia Recording This is our last lecture on Thermodynamics Which can be used to predict reaction spontaneity A AG rxn B Q vs Keq CAH rxn DASsurr E ASuniV 1 Productfavored systems have A K 1 B Kgt 1 C Klt 1 At equilibrium which of the following are true AAGO BKeq0 CKeqQ DAG1 EKeq1 l AG AGquot and Keq I AG is change in free energy at non standard conditions I AG is related to AG AGAG RTnQ where Q reaction quotient I When Q lt K or Q gt K reaction is spontaneous I When Q K reaction is at equilibrium I When AG 0 reaction is at equilibrium I Therefore AG RT In K AG AGquot and Kea Product Favored AG negative K gt 1 I Difference in free eiieiqy nf pure veartants and pine pioducts Spontanenus rear nn when a 5 K Inueasing nee energy 54 Reamnts Equilibrium Products wily mixtuie only name uf Kantianquot Thermodynamics and K6q Keq is related to reaction favorability and so to AGOrxn The the value of K the more the value of AGorxn AGO RT InK l39Xh where R 831 JKmol Thermodynamics and Keq AG rxn RT InK Calculate K forthe reaction N204 gt2 NO2 AGODm 48 kJ AG AG and Keq N7 girl a 3 1 0A0 lt g in quotl 4 sh a L 1 Reactinn is Drnductruvnred w is negative K n increasing in energy a Reactinn cnnrdinate a Productfavored 2 N02 gt N204 AG rxn 48 kJ State with both reactants and products present is more stable than complete conversion K more products than reactants AG AG and Kaq w A Ira N quotb a a A a a a 5 a m a n L 5 a k L a Radian I reactanlrlavnred ABquot is nucnive K I T imam n n energy M W Reactinn mammate a mam Reactant favored N204 gt2 NO2 AG rxn 48 kJ State with both reactants and products present is more stable than complete conversion K more reactants than products 10 Thermodynamics and K6q Keq is related to reaction favorability When AGODm reaction moves energetically downhill AGorxn is the change in free energy when reactants convert COMPLETELY to products 11 12 From Keq the energy balance at standard state AG0 can be determined With a value for A60 Keq can be calculated AG R nKeq Keq eXpAG RTJ AG 1ltl I at 298 K 250 24 x104 100 56 50 12 00 1 50 0084 100 0018 250 42 x 10395 Keq changes rapidly as a function of AG 13 The Propane Combustion Process C3Ha 9 502 9 9 4H20 9 3002 9 PCSHB 1 aim P02 1 aim PMO 1 aim PCOZ 1 aim AG AG RTan The Propane Combustion Equilibrium C3Ha 9 502 g 2 4H20 9 3002 9 O AGO Ri39ane AG RTaneq K50 eXpAG RT 14 When AGOrxn reaction moves energetically downhill A Greaterthan O Equal to O Less than 0 A B and C B C D E AampConly 15 Based on the equilibrium constant what is the value of AG for the reaction below at 25 C Agaq oiaq a AgCls Ksp 18 x 1010 R8314 JmoK A Greaterthan 0 B Equal to 0 C Less than 0 m 15 What is the value of AGO for the reaction below at 25 C A9aq Cl39aCI 9 AQCKS Ksp R8314 JmoK v 103910 A 56 kJmol 56 kJmol 56 X 103 56 X 103 56x103 rnUOw 17
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