Question

In Duman's method of estimation of nitrogen, 0.35 g of an organic compound gave 55 mL of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be (Aqueous tension at $300K=15mm$) (as nearest integer)

Answer 1

Volume of nitrogen at STP $=P_1{V}_1\ast 273/(T_1\ast 760)=700\ast 55\ast 273/760\ast 300=46ml$
mass of nitrogen $28\ast 46/22400$
% of nitrogen $=28\ast 46\ast 100/22400\ast 0.35=16.45$
nearest integer $=16$