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 )

Step-by-step solution

Pressure of aligned N ₂ gas evolved & =715-15 & =700 ~mm Hg & = 700 760 ~atm . aligned aligned Mole of N ₂ evolved & = PV RT & = 700 60 10⁻³ 760 0.0821 300 & =0.0022 ~mole aligned wt . % of nitrogen in compound aligned & = wt. of nitrogen wt. of compound 100 & = 0.063 0.4 100 & =15.71 % aligned