Posted by Janey on Tuesday, May 10, 2011 at 9:15pm.
I'll help. P goes from +5 oxidation state on the left to +3 on the right. N goes from + 3 on the left to +4 (for each)N on the right. To make it easier to balance, I would start by multiplying HNO2 by 2 so the equation will read
H3PO4 + 2HNO2 ==> N2O4 + H3PO3
To make H balance add H2O to the appropriate side.
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