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

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 (Aqueous tension at 300 K = 15 mm Hg) is________%.

(A) 1.257
(B) 12.57
(C) 20.87
(D) 18.67

Prashant Kotian · Accepted Answer

Correct answer: B. Actual pressure = 715 – 15 = 700 mm volume of N2 at STP = 300 700    = 50.28 ml 60 ml of N2 weight = 28 . 28 = 0.0628 gm % of N2 = . 0628 . × 100 = 12.57 % | JEE(Main) 2025 | DATE : 02-04-2025 (SHIFT-2) | PAPER-1 | CHEMISTRY PAGE # 3

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