Chemistry 0620 · IGCSE · Relative masses of atoms and molecules

Relative masses of atoms and molecules — practice question

The combustion equation for ethanol is shown below. $\text{C}_2\text{H}_5\text{OH} + 3\text{O}_2 \rightarrow 2\text{CO}_2 + 3\text{H}_2\text{O}$. The relative molecular mass, $M_r$, of ethanol is 46. Which statement about this reaction is correct?

  • A4.6 g of ethanol produces 4.4 g of carbon dioxide.
  • B92 g of ethanol produces 88 g of carbon dioxide and 108 g of water.
  • C138 g of ethanol reacts with 32 g of oxygen.
  • D184 g of ethanol produces 216 g of water.

Worked solution & mark scheme

This 1-mark question has a full step-by-step worked solution and mark scheme.

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI