In the estimation of nitrogen by Kjeldahl's method, $2.8 \mathrm{~g}$ of an organic compound required $20$…

In the estimation of nitrogen by Kjeldahl's method, $2.8 \mathrm{~g}$ of an organic compound required $20$ millimole of $\mathrm{H}_{2} \mathrm{SO_4}$ for the complete neutralisation of $\mathrm{NH}_{3}$ gas evolved. The percentage of nitrogen in the sample is:
  1. $20 \%$
  2. $10 \%$
  3. $40 \%$
  4. $30 \%$

Solution

Percentage of $\mathrm{N}=$ millimoles of $\mathrm{H}_{2} \mathrm{SO}_{4}=20$ milliequivalent of $\mathrm{H}_{2} \mathrm{SO}_{4}=20 \times 2=40$ Percentage of $\mathrm{N}$ in the sample $=\frac{1.4 \times 40}{2.8}=20 \%$

Asked in: JEE-TOPICTESTS-CHEMISTRY

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