[Toupadakis] 09WINTER - K versus Q TABLE

[Toupadakis] 09WINTER - K versus Q TABLE - reaction 4 For a...

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Copyright © 2009 by Kendall/Hunt Publishing Company From Chemistry Reader 2B to be published September 2009 Andreas Toupadakis Ph.D. N 2 (g) + 3H 2 (g) 2NH 3 (g) 25 o C Composition (atm) N 2 , H 2 , NH 3 Q P K eq Q P /K eq G G o Spontaneous? 1, 1, 1 1 6.1x10 5 < 1 - - Yes 1, 3, 0.020 1.5x10 -5 6.1x10 5 < 1 - - Yes 0.010, 0.030, 2.0 1.5x10 7 6.1x10 5 > 1 + - No 0.5, 1, 0 0 6.1x10 5 < 1 - - Yes 0, 0, 10 6.1x10 5 > 1 + - No Key points: 1. G o by definition does not depend on composition, in other words it does not depend or relate to Q of the reaction. 2. G o relates to K eq , thus it relates to the yield of the reaction. 3. G depends on composition, in other words it does relate to Q of the
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Unformatted text preview: reaction. 4. For a rxn with ∆ G o << 0 (i.e. with ∆ G o very negative ), it will be K eq >> 1 which means a high yield reaction. Such a reaction with ∆ G o << 0 can have either ∆ G > 0 or ∆ G < 0 depending on the composition of the reaction mixture. 5. Q P , and K eq , refer to the chemical equation as written. 6. ∆ G, ∆ G o and the word spontaneous refer to the forward reaction i.e. to the synthesis of ammonia not the decomposition. 7. Q P , K eq , ∆ G, ∆ G o and the word spontaneous refer to the same temperature....
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