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 i

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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

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​ Pressure of N 2 ​ gas = ( 715 − 15 ) = 700 mmHg n N 2 ​ ​ = RT PV ​ n N 2 ​ ​ = 760 × 0.0821 × 300 700 × 60 × 1 0 − 3 ​ = 2.24 × 1 0 − 3 mol ​ Mass of N 2 ​ = 2.24 × 1 0 − 3 × 28 g = 0.06272 g ​ % N 2 ​ = 0.5 0.06272 ​ × 100 ≃ 12.57 ​ ​

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