Practice question
Question
In Kjeldahl’s method, 0.36 g of a compound produced ammonia that neutralized 25 mL of 0.1 M H₂SO₄. What is the percentage of nitrogen?
Explanation
Moles of H₂SO₄ = 0.025 × 0.1 = 0.0025. Moles of NH₃ = 0.005 (2H per H₂SO₄). Mass of N = 0.005 × 14 = 0.07 g. Percentage = (0.07/0.36) × 100 ≈ 19.44%, which rounds to 19%.
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