Practice Final Blank 2003

Practice Final Blank 2003 - 1. (8 pts) Use the following...

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1 1. (8 pts) Use the following information to determine H f o of CH 3 OH (l). H f o (kJ /mol) CO 2 (g) – 393.5 H 2 O (g) – 241.8 2 C H 3 OH (l) + 3 O 2 (g) —> 2 CO 2 (g) + 4 H 2 O (g) H o = – 1277 kJ /mol 2. (9 pts) In class we observed the following reaction at room temperature and pressure: Ba(OH) 2 • 8 H 2 O (s) + 2 NH 4 SCN (s) —> Ba(SCN) 2 (s) + 2 NH 3 (g) + 10 H 2 O (l) The solution produced was so cold that it froze the water underneath the beaker, adhering a block of wood to the beaker. Predict the sign of G, H and S for this reaction. Circle the answers. G < 0 G > 0 G = 0 H < 0 H > 0 H = 0 S < 0 S > 0 S = 0 3. (8 pts) The major source of aluminum in the world is bauxite, a compound that consists primarily of aluminum oxide. The thermal decomposition of aluminum oxide to produce aluminum occurs via the following reaction. 2 A l 2 O 3 (s) —> 4 Al (s) + 3 O 2 (g) Given the standard enthalpy of formation of Al 2 O 3 (s), H f o = – 1676 kJ/mol, determine how many grams of aluminum will be produced when 1000 kJ of heat is consumed.
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2 4. (6 pts) Write the reactions that correspond to the following enthalpy changes: a) H f o for solid hydrogen cyanide, HCN (g). b) H f o for calcium hydroxide. 5. (6 pts) Write the electronic configuration and indicate the number of unpaired electrons for each of the following species.
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This note was uploaded on 08/06/2008 for the course CHEM 1B taught by Professor Watts during the Winter '08 term at UCSB.

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Practice Final Blank 2003 - 1. (8 pts) Use the following...

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