Chemistry 0620 · IGCSE · The mole and the Avogadro constant

The mole and the Avogadro constant — practice question

An ester, $\text{C}_4\text{H}_8\text{O}_2$, is produced when 0.06 mol of ethanol, $\text{C}_2\text{H}_6\text{O}$, reacts with 0.05 mol of ethanoic acid, $\text{C}_2\text{H}_4\text{O}_2$. $\text{C}_2\text{H}_6\text{O} + \text{C}_2\text{H}_4\text{O}_2 \rightarrow \text{C}_4\text{H}_8\text{O}_2 + \text{H}_2\text{O}$ The amount of ester formed was 0.0375 mol. What are the percentage yield and the $M_r$ of the ester?

  • Apercentage yield = 62.5; $M_r = 48$
  • Bpercentage yield = 75.0; $M_r = 48$
  • Cpercentage yield = 62.5; $M_r = 88$
  • Dpercentage yield = 75.0; $M_r = 88$

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