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Fe(NO3)2 not sure how to get the oxidation numbers of all elements

Fe(NO3)2 not sure how to get the oxidation numbers of all elements
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Fe(NO3)2 not sure how to get the oxidation numbers of all elements

User Arielorvits
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The oxidation number of oxgyen is -2. In the compound, the total charge of oxygen is -12. Fe has a charge of +2. To make the sum equal to zero, N has to have a charge of +5. -12+2+2x=0; x= +5. 
User TBhavnani
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