Practice question
Question
In the Dumas method, 0.28 g of a compound gave 60 mL of N₂ at STP. If the compound contains only C, H, and N, what is the percentage of nitrogen?
Explanation
Mass of N = (28/22400) × 60 = 0.075 g. Percentage = (0.075/0.28) × 100 = 26.79% ≈ 27%.
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