Practice question
Question
In Kjeldahl’s method, 0.5 g of an organic compound produced ammonia that neutralized 20 mL of 0.1 M H₂SO₄. What is the percentage of nitrogen?
Explanation
Moles of H₂SO₄ = 0.02 × 0.1 = 0.002. Moles of NH₃ = 0.004 (2H per H₂SO₄). Mass of N = 0.004 × 14 = 0.056 g. Percentage = (0.056/0.5) × 100 = 11.2%.
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