In the estimation of of nitrogen by Kjeldahl's method, 2.8 gm of an organic compound required 20 millimole of `H_(2)SO_(4)` for the complete neutralisation of `NH_(3)` gas evolved. The percentage of nitrogen in the simple is:

Options

A. `20%`
B. `10%`
C. `40%`
D. `30%`

Answer

A

Explanation

Percentage of `N=(1.4xx"mEq. of "H_(2)SO_(4)" used to neutralise "NH_(3))/("Weight of compound")`
m moles of `H_(2)SO_(4)=20,` mEq. Of `H_(2)SO_(4)=20xx2=40`
Percentage of N = `(1.4xx40)/(2.8)=20%`