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50 solutions

Faraday's Constant

Q. A layer of chromium is electroplated onto a metal surface by passing a constant current of 192.5 A through a cell that contains Cr3 How many minutes are required to deposit 133 g of chromium?

Solved • Mar 24, 2020

Faraday's Constant

Q. Help,please. If the current is 10.0 amperes, how long will it take to deposit 105 grams of Cr(s) onto the bumper?

Solved • Mar 16, 2020

Faraday's Constant

Q. Suppose you need to produce 25.0 g of pure copper by electrolysis of a solution of CuSO4(aq), by the reduction, Cu2+(aq) + 2 e- → Cu(s). How much time will it take with a current of 3.00 A? Coulombs = Amps x seconds. Faraday’s constant is 9.65 x 104 C/(mol e-) and the molecular weight of Cu is 63.5 g/mol.

Solved • Dec 17, 2019

Faraday's Constant

Q. HgO(s) + H2O(l) +2 e- ---> Hg(l) + 2OH-(aq). If a watch draws 1.0 x 10^-5 amperes continuously for 1200 days, what mass of Hg(l) is formed?

Solved • Dec 17, 2019

Faraday's Constant

Q. Copper can be electroplated at the cathode of an electrolysis cell by half-reaction: Cu2+(aq) + 2 e- → Cu(s) What is the amount of current that flows in the cell when the electrolysis is conducted for 180 seconds to plate 325 mg of copper?

Solved • Dec 5, 2019

Faraday's Constant

Q. An electric current transports 0.60 kC of charge in 271. milliseconds. Calculate the size of the electric current. Be sure your answer has the correct unit symbol and the correct number of significant digits.

Solved • Nov 20, 2019

Faraday's Constant

Q. Purification of copper can be achieved by electrorefining copper from an impure copper anode onto a pure copper cathode in an electrolytic cell. How many hours will it take to plate 11.5 kg of copper onto the cathode if the current passed through the cell is held constant at 38.5 A? Assume the copper in the electrolytic solution is present as Cu2+ .

Solved • Nov 23, 2019