part 1 A Cu/Cu2+ electrolysis cell was used to determine Avogadro\'s Number. The

Question

part 1 A Cu/Cu2+ electrolysis cell was used to determine Avogadro's Number. The copper cathode increased in mass by 0.036 grams after running the cell for 410 seconds at 0.42 amps. What experimental value for Avogadro's Number is determined from this data? The electron charge = 1.6x10-19 C/e- Report your answer as _____x1023 with 2 significant figures. part 2 Based on the calculated specific heat, what is the most likely identity of the metal in the previous problem? Give your answer as the elemental symbol (e.g. sodium as Na)

Explanation / Answer

410 seconds x 0.42 coulombs/second = 172.2 coulombs

Cu+2(aq) + 2e- -----> Cu(s)

0.036 gms Cu x 1mole Cu/ 63.5 g x 2 moles e-s/1mole Cu = 0.00113 moles e-s

172.2 coulombs x 1 e-/1.6 x 10^-19 coulombs = 1.076 x 10^21 e-s

1.076 x 10^21 e-s/0.00113 moles e-s = 9.5 x 10^23 e-s/mole

The Avagardro's number value from Cu/Cu2+ electrolysis = 9.5 x 10^23

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