Practice question
Question
In the Dumas method, 0.32 g of a compound gave 80 mL of N₂ at STP. What is the percentage of nitrogen?
Explanation
Mass of N = (28/22400) × 80 = 0.1 g. Percentage = (0.1/0.32) × 100 = 31.25% ≈ 31%.
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