$0.833 \, \text{mol}$ of a hydrocarbon contains $10 \, \text{g}$ of hydrogen. If the empirical formula of the compound is $CH_2O$,determine its molecular formula.

$25 \ g$ of an unknown hydrocarbon upon burning produces $88 \ g$ of $CO_2$ and $9 \ g$ of $H_2O$. This unknown hydrocarbon contains:

Provide information on the percentage proportion of elements and mixtures present in Portland cement.

$A$ compound contains $10^{-2} \%$ of phosphorus. If the atomic mass of phosphorus is $31$,the molecular mass of the compound having one phosphorus atom per molecule is :-

An organic substance $(80 \ g)$ on analysis was found to contain $C = 24 \ g$,$H = 4 \ g$,and $O = 32 \ g$. What is its empirical formula?

The elemental composition of a compound is $54.2 \% C$,$9.2 \% H$,and $36.6 \% O$. If the molar mass of the compound is $132 \ g \ mol^{-1}$,the molecular formula of the compound is: [Given: The relative atomic mass of $C:H:O = 12:1:16$]