In Duma's method for estimation of nitrogen, 0.25 g of an organic compound gave 40 mL of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 K is 25 mm, the

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In Duma's method for estimation of nitrogen, 0.25 g of an organic compound gave 40 mL of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 K is 25 mm, the percentage of nitrogen in the compound is:NEET 2015 (Phase 1)

TestHub · Accepted Answer

​ n N 2 ​ ​ = RT P V ​ = 760 × 0.082 × 300 ( 725 − 25 ) 40 × 1 0 − 3 ​ n N 2 ​ ​ = 760 × 24.6 28 ​ w N 2 ​ ​ = 760 × 24.6 28 × 28 ​ g of N 2 ​ Weight of N 2 ​ = 760 × 24.6 28 × 28 ​ gm % N 2 ​ = 660 × 24.6 1 ​ 28 × 28 ​ × 0.25 1 ​ × 100 = 16.77% ​

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