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 `= (1.4 xx "mEq. of" H_2SO_4" used to neutralise " NH_3)/("weight of compound")`
m moles of `H_2SO_4 =20, " mEq. of" H_2SO_4 = 20xx2 =40`
Percentage of N `= (1.4 xx40)/(2.8) = 20%`