Experiment 14

Experiment 14 - Data Part 1 Effect of Temperature of the...

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Part 1. Effect of Temperature of the Cell Potential Pb + Cu 2+ Cu + Pb 2+ Temperature (°C) Cell Voltage, E° cell ΔG° K 5 .481 -92818.57 J 2.76 * 10 17 16 .500 -96485 J 2.75 * 10 17 22 .506 -97642.82 J 2.55 * 10 17 45 .509 -98221.73 J 1.36* 10 16 70.1 .514 -99186.58 J 1.26* 10 15 ΔG° = -(2)(96485)(.481) = -92818.57 J K = e (92818.57/(8.314 * 278) = 2.76 * 10 17 ΔG° = -(2)(96485)(.500) = -96485 J K = e (96485/(8.314 * 289) = 2.75 * 10 17 ΔG° = -(2)(96485)(.506) = -97642.82 J K = e (97642.82/(8.314 * 293) = 2.55 * 10 17 ΔG° = -(2)(96485)(.509) = -98221.73 J K = e (98221.73/(8.314 * 318) = 1.36* 10 16 ΔG° = -(2)(96485)(.514) = -99186.58 J K = e (99186.58/(8.314 * 343.1) = 1.26* 10 15 Experimental Values (298 K, from plot) Calculated Values (298 K) ΔG° -118.44 kJ ΔG° -90.7 kJ ΔH° -94.30 kJ ΔH° -66.47 kJ ΔS° .081 kJ ΔS° 78.44 kJ K 5.6 * 10 20 K 7.9 * 10 15 ΔG° = -(2)(96485)(.47) = -90.7 kJ K = e (-90700/(8.314 * 298) = 7.9 * 10 15 Pb + Cu 2+ Cu + Pb 2+ ΔH° products - ΔH° reactants = -1.7 + 64.77 = -66.47 kJ ΔS° products - ΔS° reactants = (10.5 + 33.15) – (-99.6 + 64.81) = 78.44 kJ ΔG° = ΔH – TΔS = -(94.30 kJ) – (298)(.081 kJ) = 118.44 kJ
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Experiment 14 - Data Part 1 Effect of Temperature of the...

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