Practice question
Question
In Dumas method, 0.4 g of a compound gave 60 mL of N₂ at STP. What is the percentage of nitrogen?
Explanation
Volume of N₂ at STP = 60 mL. Mass of N = (28/22400) × 60 = 0.075 g. Percentage = (0.075/0.4) × 100 = 18.75%.
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