Question

Help guys What's wrong with this balanced equation

Answer 1

i think you forgot the NO3- part cause there is also Cu(NO3)2 which is formed...

Answer 2

Well, it is NOT balanced, that's the problem.
There are 3 nitrogen atoms on the left and 2 on the right.

To balance these redox reactions, you need to write down half-equations first.
You need a method, either using oxidatin numbers or balacing atoms in a sequence Main-oxygen-hydrogen-charges