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CHEM 433 – 12/ 1 / 11

CHEM 433 – 12/ 1 / 11. VIII. Chemical Equilibrium ( 7.1-7.4 ) • Thermodynamic description EQ - More on LeChatlier’s Principle - K at another T – quick rev - Pressure dep. – quick … - Adding reactant/product IX. Kinetics – first few comments … maybe?

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CHEM 433 – 12/ 1 / 11

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  1. CHEM 433 – 12/1/11 VIII. Chemical Equilibrium (7.1-7.4) • Thermodynamic description EQ - More on LeChatlier’sPrinciple - K at another T – quick rev - Pressure dep. – quick … - Adding reactant/product IX. Kinetics – first few comments … maybe? READ: Chapter 7 HW #10 due Friday – end of day is fine …

  2. • How/why does an increase in temperature make an endothermic reaction more favorable ? (left)(DG probably still + in this pic.) • Opposite effect for exothermic (right)

  3. LeChatlier’s Principle: A system at EQ responds to a change in a manner that counteracts the change Still working with: N2 + 3 H2 < —> 2 NH3H° = -92.2 kJ G° = -32.9 kJ/mol K (298K) = 5.9 x105 Lets examine changes in reactant product concentrations: (Calculating DrG (“not knot”) is the key here …) Suppose we have PH2 = PN2 = PNH3 = 1.0 bar Suppose:PH2 = PN2 = PNH3 = 10 bar Suppose:PH2= PN2 = 0.01 bar; PNH3= 10 bar

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