Chemistry - Mole Concept Question with Solution | TestHub

The sum of the percentage of carbon, hydrogen, and chlorine is not $100\%$ Hence the rest of the part of the compound is oxygen percentage of oxygen $=100-(18.6+1.55+55.04)=24.81\%$ Simplest ratio $=1:1:1:1$ Hence empirical formula $=$ CHCIO Empiraical formula weight $=12\times 1+1\times 1+35.5\times 1+16\times 1=64.5$ $\frac{\text{ molecular mass }}{\text{ empirical mass }}=\frac{129}{64.5}=2$ Therefore molecular formula $=\mathrm{n}\times ($ Empiricalformula $)$ Molecular formula $=2\times (\mathrm{CHCIO})$ Molecular formula ${\mathrm{C}}_2{\mathrm{H}}_2{\mathrm{Cl}}_2{\mathrm{O}}_2$