Final problem

Final problem - Chem 127 Final Prof M Tauber Name Student ID Your TA is(circle one Chen Levi Partial credit may be given where we can follow a

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Chem 127 Name: ________________________________________ Final 3/17/09 Student ID #___________________________________ Prof. M. Tauber Your TA is (circle one) Chen Levi Partial credit may be given where we can follow a correct train of thought, even if the final answer may be incorrect. Each problem is worth approximately the same point value. A calculator is allowed and NO OTHER ELECTRONIC DEVICES. Pagers and phones will lead to an automatic F on this exam, as will any unethical conduct. No “cheat sheets” are allowed. Some useful constants and formulae are listed below. These are to jog your memories- -it is up to you to recall when these are applied. c = 2.9979 x 10 8 m/s h = 6.626 x 10 -34 J s = 3.336 x 10 -11 cm -1 s k=1.38 x 10 -23 J/K = 0.695 cm -1 /K R= 8.3145 J/(K-mol) R= 8.3145 x 10 -2 L bar/(K-mol) Pressure: 10 5 Pa/bar F = 96500 C/mol vib q e p 1 1 βε = ν β ~ 1 1 hc vib e q = 0 0 nFE G = Δ V RT n solute = π μ JT = ( ) H P T from Gibbs-Helmholtz: 2 0 ln RT H dT K d reaction p Δ = Clausius Inequality: T dq dS > Standard thermodynamic values at T= 298.15K Δ H f 0 (kJ/mol) S 0 J/(mol-K) Δ G f 0 (kJ/mol) Al 2 O 3 -1676 51 -1582 H 2 O (l) -286 70 -237 CO 2 (g) -394 214 -394
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1) A motivated student in your class has brought to my attention the following method of generating hydrogen, which utilizes aluminum alloyed with gallium and ordinary water: 2Al (s) + 3H 2 O(l) Æ 3H 2 (g) + Al 2 O 3 (s) a) Give one reason why the gallium is useful in the reaction above, even if not included in the net reaction. ANSWER (explain):
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This note was uploaded on 12/13/2010 for the course CHEM 127 taught by Professor Nefzi during the Spring '03 term at UCSD.

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Final problem - Chem 127 Final Prof M Tauber Name Student ID Your TA is(circle one Chen Levi Partial credit may be given where we can follow a

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