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

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

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 %
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