In the estimation of nitrogen by Kjeldahl's method 2.8 gm of an organic compound required 20 millimole of `H_2SO_4` for the complete neutralisation of `NH_3` gas evolved. The percentage of nitrogen in the sample is:

Options

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

Answer

A

Explanation

Percentage of `N`0
`=(1.4xxmEq. of H_2SO_4" used t o n eutralise "NH_3)/("weight of compound")`
m moles of `H_2SO=20`
mEq. of `H_2SO=20xx2=40`
percentage of `N=(1.4xx40)/(2.8)=20%`