In an experiment two electrolytic cells were connected so that the same current passed through both of them. One cell contained CuSO4, the other an unknown salt. It was found that 1.25 g of copper was plated out during the same period of time that 3.42 g of the unknown metal was plated out. If the oxidation state of the unknown metal ion in the solution was +2, what is the atomic mass of the unknown ? Answer with explanations

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Q: Question attached

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Electrolysis

Electrolysis is defined as the process of breaking down ionic compounds into their constituent elements by passing a direct electric current through the compound in a fluid state. The cathode reduces cations, while the anode oxidizes anions. An electrolyte, electrodes, and some form of external power source are the main components required for conducting electrolysis. A partition, such as an ion-exchange membrane or a salt bridge, may also be used, but this is optional. These are primarily used to prevent the products from diffusing near the opposing electrode.