ME300Lecture29 - Lecture 29: Remarks on K Remarks on...

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29.1 Lecture 29: Remarks on K Remarks on Equilibrium Constant K: » Larger K means more complete combustion: – If K > 1000 (log 10 K > 3) assume complete combustion! – If K < 0.001 (log 10 K < -3) assume no reaction! 2 2 @ T=5000K: K e.g., N 2N 0.001114 Neglect dissociation of N below 5000K!
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29.2 Continue Remarks on K Example T 1 = const: K = ? 2 2 2 1 2 2 2 1 2 2 2 2 2 1 2 2 2 2 2 2 1 H 0.5O H O @1atm,T H 0.5O H O @5atm,T H 0.5O 3N H O 3N H 2O 5N H O 1.5O
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29.3 Continue Remarks on K For non-tabulated reactions, calculate K based on: o T o o o T i i,T i prod react o o o o o T i i prod react oo f ,i T 298 G K exp RT where G g g G h Ts h and h h h h
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29.4 Equilibrium Flame Temperature Review: » Stoichiometric Equilibrium Reaction: » Energy balance equation => Maximum adiabatic flame temperature A B C D A B C D Stoichimetric reaction B A B A B B B A A A C D D C D D D D C C C C
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29.5 Continue Equilibrium Flame Temperature
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ME300Lecture29 - Lecture 29: Remarks on K Remarks on...

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