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 $300 K = 15 mm Hg$ )

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Pressure of N 2 ​ gas evolved ​ = 715 − 15 = 700 mm Hg = 760 700 ​ atm . ​ ∴ Mole of N 2 ​ evolved ​ = RT PV ​ = 760 × 0.0821 × 300 700 × 60 × 1 0 − 3 ​ = 0.0022 mole ​ ∴ wt .% of nitrogen in compound ​ = wt. of compound wt. of nitrogen ​ × 100 = 0.4 0.063 ​ × 100 = 15.71% ​

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