Key Quiz 4 09-106 S 11 - Name _ Quiz 4 (10 points) 09-106...

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Name ______________________________ _ Quiz 4 (10 points) 09-106 Spring 2011 Recitation ( CIRCLE ONE TA and ONE TIME ): Christian Steve Brendan 6:30 7:30 2/3/10 (10 minutes allowed) In order to ensure the maximum amount of partial credit, please show all work and clearly circle your final answers. Thermodynamic relationships and constants are on the reverse side. 1. Determine the value of Δ H f ° for Na 2 O(s) given the following reaction. (2 points) 4 Na(s) + O 2 (g) b 2 Na 2 O(s) Δ H° = 828 kJ 2. By providing the correct chemical reactions, use Hess’s Law to illustrate how enthalpies of formation (and/or some variation of them) can be used to determine Δ H° for the following reaction: (3 points) CO 2 (g) + H 2 O(l) b H 2 CO 3 (aq) 3. (a) Using bond enthalpies of 498 kJ/mol for the O=O bond in O 2 and 445 kJ/mol for each of the O-O bonds in O 3 , calculate Δ H for the reaction: 3 O 2 (g) b 2 O 3 (g). (2 points) (b) The sign of Δ S for the above reaction is
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This note was uploaded on 09/29/2011 for the course CHEMISTRY 09-106 taught by Professor Vuocolo during the Fall '09 term at Carnegie Mellon.

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Key Quiz 4 09-106 S 11 - Name _ Quiz 4 (10 points) 09-106...

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