Chapter12Answers0

Chapter12Answers0 - Chapter 12: Answers for Review Problems...

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Unformatted text preview: Chapter 12: Answers for Review Problems Section 12.1 [I2] = 0.00384 M [MnO4 ] = 0.0200 M Section 12.2 Al(s)| Al3+(aq) || Cd2+(aq) | Cd(s) Pt(s) | Fe2+(aq) , Fe3+(aq) || Cl2(g) | Cl (aq) | Pt(s) Mn(s), Mn(OH)2 (s) || O2(g) | OH (aq) |Pt(s) E E 2 Al(s) + 3 Br2(l) Eocell =2.73 V 2 Al3+(aq) + 6 Br (aq) E ) Eocell = 0.98 V Eocell = 1.05 V Eocell = 1.55 V E Eocell = +1.86 V Eocell = 0.80 V Eocell = 0.21 V Eocell = 1.52 V E Eocell = +0.64 V Eocell = 0.89 V E Eocathode = + 1.10 V E E Eocell = 0.34 V E Eocell = + 0.62 V E Eo = 1.12 V E Eocell = + 0.93 V Ecell = + 0.95 V M Section 12.3 2 I (l) I2(s) + 2 e Zn(s) I2(s) + Zn(s) Zn2+(l) + 2 e Zn2+(l) + 2 I (l) i = 1219.5 amperes Mass Zn = = 5.86 g t = 9807.5 sec = 163 minutes Mass Al = 16.8 g t = 17884 sec = 4.97 hours E E E + 2.06 V V V Volume H2 = 0.0139 L = 13.9 mL Volume O2 = 0.00697 L = 6.97 mL Ni +4 to +2 Cd 0 to +2 g g Total mass of reactants = 119.5 g At the anode: 2 Br (l) Br2(l) + 2 e At the cathode: Na+(l) + e Na(l) At the anode: 2 Br (aq) Br2(l) + 2 e H2(g) + 2 OH At the cathode: 2 H2O (l) + 2 e Section 12.4 Extra Reduction Potentials Needed These reactions occur in basic solution E E Zn(s) + HgO(s) + H2O(l) Zn(OH)2(s) + Hg(l) t = 8.853 x 107 sec = 24592 hours Zn(s) + 2 MnO2(s) + H2O(l) E 1.364V Zn(OH)2(s) + Mn2O3(s) ...
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