Quiz 6 - 216 84 Po A) 218 84 Po B) 218 80 Hg C) 217 85 At...

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CHM2046 Quiz 6 version A Answers underlined 1 F = 96,485 C/mol e- 1A) Predict the species that will be oxidized first if the following mixture of molten salts undergoes electrolysis. Reduction potentials are given. (Cu 2+ , +0.34 V); (Mg 2+ , -2.37 V); (Cl - , +1.36 V); (F - , +2.87 V); (Br - , +1.08 V) A) Cl B) F C) 2+ Cu D) 2+ Mg E) Br ( the oxidizable species with the lowest potential ) 2A) Calculate the equilibrium constant for the following reaction at 25 °C, Co 2+ (aq) + 2 Cr 2+ (aq) Co(s) + 2 Cr 3+ (aq) given the following thermodynamic information. Co 2+ (aq) + 2 e - Co(s) E ° = -0.28 V Cr 3+ (aq) + e - Cr 2+ (aq) E ° = -0.41 V a) 5.5 × 10 -24 b) 7.5 × 10 -11 c) 4.5 × 10 -5 d) 2.5 × 10 4 e) 1.5 × 10 10 E cell = -0.28 – ( -0.41) = +0.13 V (K = e 10.12 = 2.5 × 10 4 ) 3A) Determine the identity of the daughter nuclide from the alpha decay of
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Unformatted text preview: 216 84 Po A) 218 84 Po B) 218 80 Hg C) 217 85 At D) 212 82 Pb E) 220 86 Rn Pb Po 212 82 4 2 216 84 + 4A) What mass of aluminum can be plated onto an object in 755 minutes at 5.80 A of current? Al 3+ ( l ) + 3e- Al(s) A) 73.5 g B) 24.5 g C) 220. g D) 147 g E) 8.17 g 5A) Which of the following nuclides is most likely to undergo beta decay? A) I-126 B) Al-24 C) N-13 D) Cs-137 E) Na-20 (Cs: 82n/55p 1.5; neutron rich; need to inc p+) normal Cs mass on PT 133 (I:73n/53p 1.4; ratio is lower than for Cs) END. . = + + 3 3 mol 1 Al g 26.98-e mol 3 mol 1 C 96,485-e mol 1 min 60 min 755 80 . 5 Al Al s A 12 . 10 0257 . ) 13 . ( 2 0257 . ln = = = nE K...
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This note was uploaded on 09/21/2009 for the course CHM 2046 taught by Professor Dixon during the Spring '08 term at University of Central Florida.

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