The ammonia evolved from the treatment of 0.30 g of an organic compound for the estimation of nitrogen was passed in 100 mL of 0.1 M sulphuric acid . The excess of acid required 20 mL of 0.5 M NaOH solution for complete neutralisation.The organic compound is

Options

A. acetamide
B. benzamide
C. urea
D. thiourea.

Answer

C

Explanation

Volume of unused `H_(2)SO_(4)`
`{:(N_(1)V_(1),equiv,N_(2)V_(2)),("(acid)",,"(base)"):}`
`0.2xxV_(1)=0.5xx20`
`V_(1)=(0.5xx2.0)/(0.2)=50 mL`
(b) Volume of `H_(2)SO_(4)` used
`=100-50=50 mL`
`%` of nitrogen in the compound
`=(1.4xxVxxN)/(W)`
`=(1.4xx50xx0.2)/(6.30)=46.60 %`
The percentage of nitrogen is the same as in urea `(NH_(2)CONH_(2))`
`=("Mass of N")/("Mass of Urea")xx100`
`=28/60xx10=46.6 %`