Balance the following equation by oxidation number method.
`Cu+HNO_(3)toCu(NO_(3))_(2)+NO+H_(2)O`

Explanation

To balance the equation `Cu + HNO3 → Cu(NO3)2 + NO + H2O` using the oxidation number method, we will follow these steps:

### Step 1: Assign Oxidation Numbers
- **Cu**: 0 (elemental state)
- **HNO3**:
- H: +1
- N: +5
- O: -2
...