In the Dumas method,$1 \ g$ of an organic compound gives $50 \ mL$ of $N_2$ gas at $300 \ K$ and $740 \ mm \ Hg$ pressure. If the aqueous tension at $300 \ K$ is $15 \ mm \ Hg$,what is the percentage of nitrogen in the compound?

From $0.50 \ g$ of an organic compound,ammonia is evolved and absorbed in $50 \ mL$ of $0.5 \ M \ H_2SO_4$. In the titration of the excess $H_2SO_4$,$60 \ mL$ of $0.5 \ M \ NaOH$ is used. Calculate the percentage of nitrogen in the compound. (in $\%$)

Following Kjeldahl's method,$1 \ g$ of organic compound released ammonia,which neutralized $10 \ mL$ of $2 \ M \ H_2SO_4$. The percentage of nitrogen in the compound is . . . . . . $\%$.

$0.25 \ g$ of an organic compound containing chlorine gave $0.40 \ g$ of silver chloride in Carius estimation. The percentage of chlorine present in the compound is $.....$ [in nearest integer].
(Given: Molar mass of $Ag$ is $108 \ g \ mol^{-1}$ and that of $Cl$ is $35.5 \ g \ mol^{-1}$)

How much $\%$ sulphur is present in an organic compound if on analysis $0.53 \ g$ of this compound gives $1.158 \ g$ of $BaSO_4$ (in $\%$)?

On complete combustion,$0.30 \, g$ of an organic compound gave $0.20 \, g$ of carbon dioxide and $0.10 \, g$ of water. The percentage of carbon in the given organic compound is $.....$ (Nearest Integer).