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Yes, n is the number of moles of electrons transferred in the redox reaction. After writing the two half-reactions, make sure they have an equal number of electrons being transferred, so that they cancel out when you add the half-reactions back together. Multiply the reactants and products in a reaction by the same number to do so.
When finding n though, make sure you don't accidentally double the value. You only need to count the electrons on one side of the redox reaction, as they are being transferred. So if 2 electrons are being transferred from Fe to Cl for example, make sure you don't count 4 from the 2 being transferred and the 2 being accepted.
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