In $CH_3CH_2Br$,the percentage of $Br$ is:

An organic compound contains $C = 38.8\%$,$H = 16\%$ and $N = 45.2\%$. The empirical formula of the compound is:

$A$ compound $(60 \ g)$ on analysis gave $C = 24 \ g$,$H = 4 \ g$,$O = 32 \ g$. Its empirical formula is

The empirical formula of a carbohydrate is $CH_2O$. If $0.1 \, \text{mol}$ of this carbohydrate contains $1 \, g$ of hydrogen,what is its molecular formula?

The complete combustion of $0.492 \, g$ of an organic compound containing $'C'$,$'H'$,and $'O'$ gives $0.793 \, g$ of $CO_{2}$ and $0.442 \, g$ of $H_{2}O$. The percentage of oxygen composition in the organic compound is .... (nearest integer)

The empirical formula of a compound is $CH_2O$ and its vapor density is $30$. The molecular formula of the compound is ......