`29.5mg` of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved ammonia was absorbed in `20mL` of `0.1M HCl` solution. The excess of for complete neutralization. The percentage of nitrogen in the compound is

Options

A. `23.7`
B. `29.5`
C. `59.0`
D. `47.4`

Answer

A

Explanation

`underset((HCl))(M_(1)V_(1))=underset((NaOH))(M_(2)V_(2))`
`0.1xxV=0.1xx15`
`V_(HCl)=15ml`
`:.` Volume of `HCl` used by `NH_(3)`
`=20-15=5ml`
`%` of `N=(1.4NV)/(W)`
`N=` Normality of acid used
`V=` Volume of acid used
`W=` wt. of organic compound
For `HCl`, normality `=` Molarity ( `:.` Basicity is `1`)
`%` of `N=(1.4xx0.1xx5)/(29.5xx10^(-3))=23.73%`