May 30, 2016

Homework Help: Electrochemistry

Posted by Jerry on Thursday, May 17, 2007 at 11:01am.

A current of 2.50 A is passed through a solution containing Cu+2 ions for 4.00 hours. Calculate the mass of Cu atoms that form at the cathode.

Charge= current*time

Convert the charge in coulombs to number of electrons.

Since it takes two electrons per Cu+2 atom, divide the number of electrons by two, and you have the number of atoms of Cu. Change this to mass, either by mass/atom, or change to moles (avag number), then to mass.

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