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

Step-by-step solution

aligned & Pressure of N ₂ gas =(715-15) & array l =700 mmHg n _ N ₂ = PV RT n _ N ₂ = 700 60 10⁻³ 760 0.0821 300 =2.24 10⁻³ ~mol array & array r Mass of N ₂=2.24 10⁻³ 28 ~g =0.06272 ~g array & array r % ~N ₂= 0.06272 0.5 100 12.57 array aligned