I struggle with Oxidation numbers. Please help. The compounds listed below are f

Question

I struggle with Oxidation numbers. Please help. The compounds listed below are followed by oxidation numbers.Determine whether these are the correct oxidation numbers for theelements in each compound.
BrO3- (+5,-2) PO43- (+5,-2)
Fe2O3 (+6,-2)
HCO3- (+1,+4,-2) Cr2O72- (+6,-2) I struggle with Oxidation numbers. Please help. The compounds listed below are followed by oxidation numbers.Determine whether these are the correct oxidation numbers for theelements in each compound.
BrO3- (+5,-2) PO43- (+5,-2)
Fe2O3 (+6,-2)
HCO3- (+1,+4,-2) Cr2O72- (+6,-2)

Explanation / Answer

The key to this problem is to know Oxygen has a -2 oxidationstate 1) The total is -1. Oxygen has 3X2 = -6, so Br would have a +5charge. This is true Continuing this trend. and you will get the followinganswers: 1) True 2) True 3) False Iron is +3 not 6 4) True 5) True. Just add the oxidation states to get the total charge of themolecule

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