Chemistry 0620 · IGCSE · The mole and the Avogadro constant

The mole and the Avogadro constant — practice question

When iron sulfide, $\text{FeS}_2$, is heated in air, sulfur dioxide is formed. $4\text{FeS}_2 + 11\text{O}_2 \rightarrow 2\text{Fe}_2\text{O}_3 + 8\text{SO}_2$ What is the greatest mass of sulfur dioxide that can be obtained from 120 kg of iron sulfide?

  • A$64\ \text{kg}$
  • B$128\ \text{kg}$
  • C$240\ \text{kg}$
  • D$512\ \text{kg}$

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