In Dumas’ method for estimation of nitrogen, 0.3 g of an organic com

1.	In Dumas’ method for estimation of nitrogen, 0.3 g of an organic compound gave 50 mL of nitrogen collected at 300K temperature and 715 mm pressure. Calculate the percentage composition of nitrogen in the compound. (Aqueous tension at 300K=15 mm).
Answer» Volume of nitrogen collected at 300K and 715mm pressure is 50 mL Actual pressure = 715-15 =700 mm Volume of Nitrogen at STP=27370050/300760 =41.9 ml 22400 ml of Nitrogen at STP weighs = 28 g 41.9 ml of Nitrogen weighs = 2841.9/22400 g % of Nitrogen = 2841.9100/22400*0.3 = 17.45 %

In Dumas’ method for estimation of nitrogen, 0.3 g of an organic compound gave 50 mL of nitrogen collected at 300K temperature and 715 mm pressure. Calculate the percentage composition of nitrogen in the compound. (Aqueous tension at 300K=15 mm).

Answer»

Volume of nitrogen collected at 300K and 715mm pressure is 50 mL

Actual pressure = 715-15 =700 mm

Volume of Nitrogen at STP=273*700*50/300*760

=41.9 ml

22400 ml of Nitrogen at STP weighs = 28 g

41.9 ml of Nitrogen weighs = 28*41.9/22400 g

% of Nitrogen = 28*41.9*100/22400*0.3

= 17.45 %