Chemistry
posted by Jess .
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.

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.
Respond to this Question
Similar Questions

math,algebra II
I have to work with these types of problems dealing with matrises can someone show me how to solve them.Heres one of them: Directions: Find the values of the variables in each equation in the first matrix it looks like this a+2 3z+1 … 
Chemistry
Electron Transfer Theory Write an label the oxidation and reduction halfreaction equations. a) Ni(s) + Cu(NO3)2(aq) > Cu(s)+ Ni(No3)2(aq) oxidation  Ni(s) > Ni2+(aq) + 2e reduction  Cu2+(aq) + 2e > Cu(s) b) Pb(s) + … 
Chemistry
Electron Transfer Theory Write an label the oxidation and reduction halfreaction equations. a) Ni(s) + Cu(NO3)2(aq) > Cu(s)+ Ni(No3)2(aq) oxidation  Ni(s) > Ni2+(aq) + 2e reduction  Cu2+(aq) + 2e > Cu(s) b) Pb(s) + … 
vectors
ok theres a graph. its like this. basically theres a ray coming from the origin going up and left diagonally at about a 30 degree angle. the question says "for the following vectors draw the component vectors along the x and y axis". … 
Social Studies
Are competition and good conduct compatible when it comes to the broadcasting industry? 
statistics
investigators at an agricultural research facility randomly assigned equal numbers of chicken to be housed in two rooms. In room #1, chickens experienced normal day/night cycles. In the other room, lights were left on 24 hours a day. … 
Chemistry
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? 
Chemistry
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? 
chemistry
Balancing redox equations reactants: Cu, NO3^ (the negative sign is nex to the O, above the 3). products: Cu^2+, NO2 Medium: Acidic Cu+ NO3^ > Cu^2+ + NO2 Okay, I don't understand how to do this problem...but something someone … 
Math
1)If a (theres a square)b is defined as the average of a and b, what is the value of 2 (theres a square) 4 (theres a square) 9?