In Dumas' method for estimation of nitrogen 0.4 g 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 is
(Given : Aqueous tension at $300 \mathrm{~K}=15 \mathrm{~mm} \mathrm{Hg}$ )

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In Dumas' method for estimation of nitrogen 0.4 g 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 is
(Given : Aqueous tension at

300 \mathrm{~K}=15 \mathrm{~mm} \mathrm{Hg}

)

Quantrex Academy · Accepted Answer

Correct answer: A. 15.71 \%

Pressure of aligned N_2 gas evolved & =715-15 \& =700 mm Hg \& =(700)/(760) atm. aligned aligned Mole of N_2 evolved & = PV RT \& = 700 × 60 × 10^ -3 760 × 0.0821 × 300 \& =0.0022 mole aligned wt. \% of nitrogen in compound aligned & = wt. of nitrogen wt. of compound × 100 \& =(0.063)/(0.4) × 100 \& =15.71 \% aligned

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