In Dumas' method for estimation of nitrogen, 0.5 gram of an organic compound gave 60 mL of nitrogen collected at 300 K…
Some Basic Concepts (Mole Concept) · Class 11 · JEE Main Previous Year Question
In Dumas' method for estimation of nitrogen, 0.5 gram of an organic compound gave 60 mL of nitrogen collected at 300 K temperature and 715 mm Hg pressure. The percentage composition of nitrogen in the compound is: (Aqueous tension at 300 K = 15 mm Hg)
- a
1.257
- b
20.87
- c
18.67
- d✓
12.57
12.57
🧠 Same Dumas trick, different sample mass Just like Dumas with any sample — subtract aqueous tension first, find moles of from , then take the percentage in the original sample.
🗺️ Step by step Dry pressure .
Moles of :
Mass of N .
⚠️ Common mistake This is exactly MOLE-208 with sample mass instead of . Same setup, just a bigger denominator — so N is smaller.
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