Kjeldahl's method is used in the estimation of:

$0.3780 \, g$ of an organic chloro compound gave $0.5740 \, g$ of silver chloride in Carius estimation. Calculate the percentage of chlorine present in the compound. (in $\%$)

Explain the Carius method and its principle for the estimation of phosphorus in an organic compound.

Quantitative measurement of nitrogen in an organic compound is done by the method:

$x \ mg$ of an organic compound was analysed by the Kjeldahl method. The ammonia evolved was absorbed in $50 \ mL$ of $0.5 \ M \ H_2SO_4$. The unused acid required $60 \ mL$ of $0.5 \ M \ NaOH$ solution for complete neutralization. If the percentage of nitrogen in the compound is $56$,the value of $x$ is:

In Dumas method for the estimation of $N_2$,the sample is heated with copper oxide and the gas evolved is passed over :