I. Experimental data show a compound contains $25\%$ carbon, $2\%$ hydrogen and $73\%$ chlorine and has a molar mass of $96.9 \ g/mol$. This compound has a molecular formula of $C_2H_2Cl_2$.
II. A 100g sample of this compound would contain $25g$ of carbon ($~2$ mol), $2$ g of hydrogen ($~2$ mol), and $73g$ chlorine ($~2$ mol).