Chem_208_24_07_web -...

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1 Cornell-companions-k9-k@googlegroups.com PS 9 Due Friday PS10 Distributed Today Today: Finishing Ch. 19 Starting Electrochemistry Ch 20.1-20.2
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2 Dependence of Free Energy on Pressure Consider the hypothetical reaction aA(g) +bB(g) cC(g) + dD(g): quotient reaction the is Q where Q, ln RT G P P P P ln RT G G o b B a A d D c C o + = + = If G<0, reaction proceeds to right If G=0, reaction is at equilibrium Haber Process: N 2 (g) + 3H 2 (g) 2NH 3 (g) G o = -33.3 kJ a) Is reaction spontaneous under standard conditions? b) Is reaction spontaneous if T increased to 200 o C (473K)? c) Is reaction spontaneous at 25 o C with PNH 3 = 1.00 bar, P N2 = 1.47 bar, and P H2 = 1.00 x 10 -2 bar? Yes No At eq’m
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3 Free Energy and the Equilibrium Constant, K eq G = G o + RT lnQ At equilibrium: G = 0 and Q = K eq 0 = G o + RT lnK eq G o = - RT lnK eq We can calculate K eq from G o and vice versa
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4 Measurement of the temperature
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This note was uploaded on 05/18/2008 for the course CHEM 2080 taught by Professor Davis,f during the Spring '07 term at Cornell University (Engineering School).

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Chem_208_24_07_web -...

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