In the $Kjeldahl$ method,when an organic compound containing nitrogen is heated with concentrated $H_2SO_4$,nitrogen is converted into which of the following?

In Kjeldahl's method for the estimation of nitrogen,$3.88 \ mg$ of an organic compound produces ammonia which requires $5.73 \ mL$ of $0.011 \ N$ $HCl$ for neutralization. Calculate the percentage of nitrogen in the compound.

Discuss the principle of estimation of halogens,sulphur,and phosphorus present in an organic compound.

For the estimation of nitrogen,$1.4 \ g$ of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in $60 \ mL$ of $\frac{M}{10}$ sulphuric acid. The unreacted acid required $20 \ mL$ of $\frac{M}{10}$ sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is .....$\%$

Consider the following reaction. On estimation of bromine in $1.00 \ g$ of $R$ using Carius method,the amount of $AgBr$ formed (in $g$) is . . . .
$\overline{[Given :}$ Atomic mass of $H = 1, C = 12, O = 16, P = 31, Br = 80, Ag = 108]$

How is the percentage of oxygen determined in the quantitative estimation of organic compounds?