Insulin contains $3.4 \%$ sulfur by weight. What is its minimum molecular mass?

The molecular mass of an organic compound is $108 \ g \ mol^{-1}$. If $C, H,$ and $N$ atoms are present in the weight ratio of $9 : 1 : 3.5$,what is the molecular formula?

Define Percentage Composition in a compound.

The formula of ferric sulphate is:

In each molecule of carbon tetrachloride,the mass percent of carbon and chlorine respectively are

Substances $X$ and $Y$ have the same mass. If their atomic weights are $30$ and $20$ respectively,and the molecular weight of the compound is $120$,what is the molecular formula of the compound?