An organic compound contains 69.4% carbon and 5.8% hydrogen. A sample of 0.303 g of this compound was analysed for nitrogen by Kjeldahl's method. The ammonia evolved was absorbed in 50 mL of 0.05 M `H_2 SO_4`. The excess acid required 25 mL of 0.1 M NaOH for neutralisation. Determine the molecular formula of the compound, if its molecular mass is 121.

Explanation

To determine the molecular formula of the organic compound based on the given data, we will follow these steps:

### Step 1: Calculate the percentage of nitrogen in the compound
1. **Volume of H₂SO₄ used for absorption of ammonia**:
- Total volume of H₂SO₄ = 50 mL
- Volume of H₂SO₄ used for neutralization with NaOH = 25 mL
- Volume of H₂SO₄ absorbed = 50 mL - 25 mL = 25 mL

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