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Oxidation Number Method

How do you balance this equation using the oxidation number method only?
ClO4)-1 +Al+H)+1---->Cl-1 +Al+3 +H2O

Also, How many mole of Fe2+ react with each mole of cr2O7)-2 when properly balanced 6?
Cr2O7)2- + H+ +Fe2+ ---->Fe3+ Cr3+ +H2O

Solution Summary

The solution is comprised for a detailed step by step explanation of how to balance a chemical equation using the oxidation number method.

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