# Oxidation number of N in HNO3Watch

Announcements
#1
??? Can anyone helkp as to how they got the answer +5? I thought it would be -5.
0
11 years ago
#2
3 oxygens at -2 each, one hydrogen (+1), so N must be +5 to sum to zero.
0
#3
But the 3 oxygens are -6, plus the 1 from the hydrogen would have to make the N -5, not +5???
0
11 years ago
#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
2
#5
Oh wait I get it. Thanks!
0
11 years ago
#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
0
1 year ago
#7
Considered N=x and oxidation number of H is 1. Oxidation number of O is -2 but there is O3 so -2*3=6.x 1-6=0x-5=0x=5.
0
1 year ago
#8
Wow. Over forty thousand views for such a boring thread with only (up until now) five posts.

Way to go Sak****, you've found an over nine year old thread and added to the conversation. I bet shenzys will sleep easy tonight knowing his question has been answered (not for the first time, that honour must go to billykwok also over nine years ago).

I wonder what shenzys will be up to now? Certainly not working out oxidation states of nitrogen, I'll bet.
0
1 year ago
#9
But nitrogen has no d orbital so how it can expand and get oxidation state 5
0
1 year ago
#10
(Original post by Vinay123567890)
But nitrogen has no d orbital so how it can expand and get oxidation state 5
don't post on a 10 year thread buddy.
0
10 months ago
#11
It cannot be -5 because oxygen is more electronegative than nitrogen.. So here nitrogen exhibits positive oxidation state
0
X

new posts

### 1,029

people online now

### 225,530

students helped last year
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### University open days

• University of Dundee
Mon, 26 Aug '19
• University of Aberdeen
Tue, 27 Aug '19
• Norwich University of the Arts
Sat, 31 Aug '19

### Poll

Join the discussion

At least 5 GCSEs at grade 4 (65)
14.54%
At least 5 GCSEs at grade 5 (69)
15.44%
At least 5 GCSEs at grade 6 (84)
18.79%
Higher than 5 GCSEs at grade 6 (180)
40.27%
Pass in English and Maths GCSE (21)
4.7%
6.26%