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Why does the answer key use 2 electrons for the oxidation reaction when the oxidation number only changes by 1? Why does the answer key use 6 electrons for the reduction reaction when the oxidation number only changes by 3?
When determining the number of electrons to place on a side, you have to compare the overall charge on the left and right sides. Generally, let's say for example, there is a higher positive charge on the left side, you would add that number of electrons on the right side to balance the difference in charge.
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