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MAC 4G wrote:I think you can look at the redox pair: Fe3+ and Fe2+. Since there are 6 of Fe3+ that means the charge is 18+. There are 6 of Fe2+ so the charge is 12+. The difference between the two is 6 electrons.
How come the the Cr pair doesn't work then? 2 of Cr3+ = 6+, but then you have Cr2O72- so you're going from 6+ to 2- That is not a difference of 6. Why doesn't it match the Fe pair?
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