Question

0.25 gram of a organic compound gave 31.1 mL N₂ by Duma method % of nitrogen will be ______.

Options

• 18.55

• 15.55

• 21.45

• 31.56

Answer 1

0.25 gram of a organic compound gave 31.1 mL N₂ by Duma method % of nitrogen will be 15.55.

Explanation: 

Wt of organic compound = 0.25 gram volume of nitrogen = 31.1
\[\%\mathrm{N}=\frac{28\times\mathrm{V}\quad100}{22400\times w}=\frac{0.125\times\mathrm{V}}{w}\]
\[=\frac{0.125\times31.1}{0.25}=15.55\%\]