Posted by Jess on Wednesday, April 6, 2011 at 2:17pm.
I have a question which asks...
What is the Oxidation number of Nitrogen in Cu(NO3)2
I know the answer is 5+ but how do you get that??
Cu= 2+
O= 2 (Theres 3 of them so 2x3=6...then, theres a two out of the brackets so 6 x 2 =12)
+2  (12)= 10? And then what?
I think my method is wrong. :/ It's really frustrating and i've been at the same question for over an hour now.

Chemistry  DrBob222, Wednesday, April 6, 2011 at 5:22pm
I do it this way. First, do everything except the element of interest.
Cu +2
6 O = 12
The only thing left is N. So for the N in the formula, we have 12+2 = 10; therefore, N must be +10 to make everything zero. There are 2 N atoms @ +10 total which makes each N = +5.
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