Question

Balance the following equation in acidic conditions. Phases are optional. Cu NO3,

Answer 1

If your equation is Cu+NO^- 3-->Cu^2+NO, then the answer is 
2 Cu + 1 NO3{-}  → 1 Cu^{2+} + 3 NO 

To check if it is balance, this is the solution:
2- Cu- 2
3- N -3
3- O -3