Write the empirical formulae of the following :
`(i) N_(2)O_(4) (ii)C_(6)H_(6)(iii)C_(6)H_(12)O_(6)(iv)H_(2)O_(2)(v)H_(2)O (vi) Na_(2)CO_(3) (vii)CH_(3)COOH`

Explanation

To find the empirical formula for each compound, we need to determine the simplest whole number ratio of the atoms present in the molecular formula. Here’s how we can derive the empirical formulas for the given compounds step by step:

### Step-by-Step Solution:

1. **For N₂O₄:**
- Count the atoms: 2 Nitrogen (N) and 4 Oxygen (O).
- Divide both by the greatest common divisor (GCD), which is 2.
- Empirical formula: NO₂.
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