Unit 5- Module 1-ProbsKey

Unit 5- Module 1-ProbsKey - Predictions of Energetic and...

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Predictions of Energetic and Entropic Stability Problems for Contemplation Key 1) Rank the indicated bonds in order of increasing bond dissociation energy. Cl CCl 3 Br CCl 3 I CCl 3 1 (weakest) 3 (strongest) 2 N N HN NH H 2 N NH 2 3 (strongest) 2 1 (weakest) 2) Predict whether the following reactions are energetically and entropically favored? After you make your predictions, use the tables in your text that provide bond enthalpies to verify your predictions for the energetic stability of each reaction. C 2 H 5 NO 2 is the amino acid glycine (shown in the picture). Chemical Reaction ∆H o rxn ∆S o rxn CO 2 (g) + 4 H 2 (g) CH 4 (g) + 2 H 2 O (l) N 2 (g) + 3 H 2 (g) 2 NH 3 (g) H 2 CO (g) + HCN (g) + H 2 O (l) C 2 H 5 NO 2 (s) 2 CH 4 (g) + NH 3 (g) + 2 H 2 O (l) 5 H 2 (g) + C 2 H 5 NO 2 (s) + + 2 CO (g) + NH 3 (g) + 2 H 2 (l) C 2 H 5 NO 2 (s) 3) Consider the formation of CX 4 compounds as shown where X = F, Cl or Br. C
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This note was uploaded on 03/29/2010 for the course CHEM 152 taught by Professor Grall during the Spring '08 term at University of Arizona- Tucson.

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Unit 5- Module 1-ProbsKey - Predictions of Energetic and...

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