Chemistry 0620 · IGCSE · Formulae

Formulae — practice question

The relative molecular mass of an alcohol is $88$. Its percentage composition by mass is given as: C, $54.5\%$; H, $9.1\%$; O, $36.4\%$. Which row gives the empirical formula and molecular formula of this alcohol?

  • Aempirical formula $\text{C}_2\text{H}_4\text{O}$, molecular formula $\text{C}_2\text{H}_4\text{O}$
  • Bempirical formula $\text{C}_2\text{H}_4\text{O}$, molecular formula $\text{C}_4\text{H}_8\text{O}_2$
  • Cempirical formula $\text{C}_4\text{H}_8\text{O}_2$, molecular formula $\text{C}_4\text{H}_8\text{O}_2$
  • Dempirical formula $\text{C}_4\text{H}_8\text{O}_2$, molecular formula $\text{C}_2\text{H}_4\text{O}$

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