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# Oxidation number of N in HNO3

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1. ??? Can anyone helkp as to how they got the answer +5? I thought it would be -5.
2. 3 oxygens at -2 each, one hydrogen (+1), so N must be +5 to sum to zero.
3. But the 3 oxygens are -6, plus the 1 from the hydrogen would have to make the N -5, not +5???
4. H = +1
O x 3 = -2 x 3
= -6
net charge on molecule = 0

So +1 -6 +N = 0
=> N = 0+6-1
= +5
5. Oh wait I get it. Thanks!
6. (Original post by billykwok)
H = +1
O x 3 = -2 x 3
= -6
net charge on molecule = 0

So +1 -6 +N = 0
=> N = 0+6-1
= +5

Bilbo - geek

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