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n represents the number of electrons transferred in the balanced reaction. The reaction shows that Fe(s) is getting oxidized since it's oxidation state changes from 0 as Fe(s) to 2+ in 2 Fe(OH)2(s). So for every Fe(OH)2 formed, 2 electrons are being transferred. Since the reaction states that there are 2 molecules of Fe(OH)2, a total of 4 electrons are being transferred in the reaction.
For that I understand that two electrons are being transferred, but how come it needs to be multiplied by 2? There are 2 molecules of Fe(OH)2 by there are also 2 of Fe, so shouldn't it be a one to one ratio?
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