An ornamental of gold having $75\%$ of gold,it is of .............. carat.

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

An organic compound has an empirical formula of $CH_2O$ and a molecular mass of $90$. What is its molecular formula? $(C = 12, H = 1, O = 16)$

An organic compound contains carbon,hydrogen,and oxygen. Its elemental analysis gives $38.71 \%$ of $C$ and $9.67 \%$ of $H$. The empirical formula of the compound would be $:-$

$20$ carat gold contains ...... $(\%)$ percent gold.

In a compound,$C$,$H$,and $N$ atoms are present in $9 : 1 : 3.5$ by weight. The molecular weight of the compound is $108$. What is the molecular formula of the compound?