Balance the following equation by the oxidatoin number method.
`Cu+HNO_(3) to Cu(NO_(3))_(2)+NO_(2)+H_(2)O`

Explanation

To balance the equation `Cu + HNO3 → Cu(NO3)2 + NO2 + H2O` using the oxidation number method, follow these steps:

### Step 1: Assign Oxidation Numbers
- **Cu** (Copper) in its elemental form has an oxidation number of **0**.
- **HNO3** (Nitric Acid):
- H: +1
- O: -2 (for three O, total -6)
- Let N be x: x + 1 - 6 = 0 → x = +5 (Oxidation number of N is +5)
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