JEE MAIN - Chemistry (2025 - 4th April Morning Shift - No. 22)
In Dumas' method for estimation of nitrogen 1 g of an organic compound gave 150 mL of nitrogen collected at 300 K temperature and 900 mm Hg pressure. The percentage composition of nitrogen in the compound is _______ % (nearest integer)
(Aqueous tension at $300 \mathrm{~K}=15 \mathrm{~mm} \mathrm{~Hg}$ )
Answer
20
Explanation
Partial pressure of $\mathrm{N}_2=(900-15)=885 \mathrm{~mm} \mathrm{Hg}$
Mole of $\mathrm{N}_2=\frac{\left(\frac{885}{760} \times 0.15\right)}{(0.0821 \times 300)}=0.0071$ moles
$\%$ of nitrogen in organic compound
$$\begin{aligned} & =\frac{(0.0071 \times 28)}{1} \times 10 \\ & =19.85 \% \end{aligned}$$
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