Some of the fertilisers are sodium nitrate `NaNO_(3)`, ammonium sulphate `(NH_(4))_(2)SO_(4)` and urea `CO(NH_(2))_(2)`. Which of these contains the highest percentage of nitrogen ?

Explanation

To determine which fertilizer contains the highest percentage of nitrogen, we will calculate the percentage of nitrogen in each of the three fertilizers: sodium nitrate (NaNO₃), ammonium sulfate ((NH₄)₂SO₄), and urea (CO(NH₂)₂).

### Step 1: Calculate the molar mass of each compound

1. **Sodium Nitrate (NaNO₃)**:
- Sodium (Na): 23 g/mol
- Nitrogen (N): 14 g/mol
- Oxygen (O): 16 g/mol (3 O atoms)
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