A chemistry problem

1. The problem statement, all variables and given/known data

As + HNO3 (consentrated) -> H3AsNO4 + NO2 + H2O

2. Relevant equations

none

3. The attempt at a solution

I tried doing the electron equation:

As (0) - 1 electron = As (1+) | 1
N (5+) + 1 electron = N (4+) | 1

I dont know if this is right. (The last 2 numbers are supposed to represent the numbers which should go in the equation before those elements.)
Think the oxydation level is supposed to change, but the sides dont balance out. What am I doing wrong? I just cant get this out of my head anymore.

Thanks in advance,
fawk3s

 

Im not sure actually. The equation was given like that and Im not even sure what the oxydation levels are supposed to be.
My task was only to balance the sides.

 

Yeah, that would explain why I cant figure it out still after trying for an hour or so.

And yes, I know how to calculate the oxidation numbers, but if the oxidaton number of N didnt change during the reaction, then As has to be 0. And that would be odd.

Anyways, thanks for the help !