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54 solutions

Faraday's Constant

Q. How many minutes will it take to electroplate 31.1 g of gold by running 5.00 A of current through a solution of Au^+(aq)? Express your answer to three significant figures and include the appropriate units.

Solved • Mar 7, 2020

Faraday's Constant

Q. An electrolytic process oxidizes nickel sulfide in a two-step reaction: Ni3S2(s) → Ni^2+(aq) + 2NiS(S) + 2e^- 2NiS(s) → 2Ni^2+(aq) + 2S(s) + 4e^- Ni3S2(s) → 3Ni^2+(aq) + 2(s) + 6e^- What mass of Ni2+ is produced in solution by passing a current of 67.0 A for a period of 12.0 h, assuming the cell is 85.0 % efficient? Express your answer numerically in grams.

Solved • Mar 5, 2020

Faraday's Constant

Q. How many minutes will it take to electroplate 60.1 g of gold by running 5.00 A of current through a solution of Au^+(aq)? Express your answer to three significant figures and include the appropriate units.

Solved • Mar 5, 2020

Faraday's Constant

Q. What mass of (Cu(s) is electroplated by running 13.5 A of current through a Cu^2+ (aq) solution for 4.00 h? Express your answer to three significant figures and include the appropriate units.

Solved • Mar 5, 2020

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