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1. Assign oxidation numbers to all atoms in the equation...

S + HNO

_{3}--> SO

_{2}+ NO + H

_{2}O

This particular problem is an example in my Chem book so I already know the answers. I just don't understand why they are what they are. I understand this part: All free, uncombined elements have an oxidation number of zero. ...so that's simple...it's the rest I'm not getting.

The first part that throws me is the HNO

_{3}part. Why is N +5?