When Thomas Edison first sold electricity, he used zinc coulometers to measure c

Question

When Thomas Edison first sold electricity, he used zinc coulometers to measure charge consumption. (In a coulometer the cathode is weighed before a current is passed through it, and then again after the passage of current. The weight increase is proportional to the amount of current that flows through the cathode.) If the zinc plate in one of Edison's coulometers increased in mass by 14.41 g, how much charge had passed through it. Enter in Coulombs.

Determine how many moles of zinc accumulated. Then multiply by the stoichiometric ratio to determine the number of moles of electrons that passed. Then convert moles of electons into Coulombs.

Explanation / Answer

No.of moles of zinc accumulated = 14.41/65.38 = 0.22

Moles of electrons of zinc accumulated = 0.22*30*6.023*10^23 = 3.98*10^24

Charge of electrons of zinc accumulated = 6.38*10^5 coulombs

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