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  4. In Dumas method 0.5 g of an organic compound containing nitrogen gave 112 ml of nitrogen at S.T.P. The percentage of nitrogen in the given compound is

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Q. In Dumas method 0.5 g of an organic compound containing nitrogen gave 112 ml of nitrogen at S.T.P. The percentage of nitrogen in the given compound is

NTA AbhyasNTA Abhyas 2022

Solution:

$\% \, N=\frac{28}{22400}\times \frac{V o l u m e \, o f \, N_{2} \, a t \, S T P \left(\right. m l \left.\right)}{W e i g h t \, o f \, o r g a n i c \, c o m p o n d}\times 100$
% $N=\frac{28}{22400}\times \frac{112}{0.5}ml\times 100=28$ %