JEE Mains · Chemistry · STD 11 - 8.3. Organic chemistry purification and characterization
In Dumas' method for estimation of nitrogen, 0.5 gram 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 (Aqueous tension at \(300 \mathrm{~K}=15 \mathrm{~mm} \mathrm{Hg})\) is _______.
- A 1.257
- B 20.87
- C 18.67
- D 12.57
Answer & Solution
Correct Answer
(D) 12.57
Step-by-step Solution
Detailed explanation
\begin{aligned} & \text { Pressure of } \mathrm{N}_2 \text { gas }=(715-15) \\ & \begin{array}{l}=700 \mathrm{mmHg} \\ \mathrm{n}_{\mathrm{N}_2}=\frac{\mathrm{PV}}{\mathrm{RT}} \\ \mathrm{n}_{\mathrm{N}_2}=\frac{700 \times 60 \times 10^{-3}}{760 \times 0.0821 \times 300} \\…
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