In Dumas’ method for estimation of nitrogen 0.4 g 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 com

Question

In Dumas’ method for estimation of nitrogen 0.4 g 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 (Given : Aqueous tension at 300 K = 15 mm Hg)

(A) 7.85 %
(B) 20.95 %
(C) 17.46 %
(D) 15.71 %

Prashant Kotian · Accepted Answer

Correct answer: D. Actual pressure = 715 – 15 = 700 mm Volume of N2 at STP = 300 700    = 50.28 ml 60 ml N2 weight = 28 . 28  = 0.0628 g % of N2 = . 0628 . ×100 = 15.7%

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