Chemistry 0620 · IGCSE · The mole and the Avogadro constant

The mole and the Avogadro constant — practice question

The balanced equation for the reaction of hydrogen sulfide, $\text{H}_2\text{S}$, with oxygen is shown. $2\text{H}_2\text{S} + 3\text{O}_2 \rightarrow 2\text{SO}_2 + 2\text{H}_2\text{O}$. What mass of oxygen is needed to react with $5.1\,\text{g}$ of hydrogen sulfide?

  • A$2.4\,\text{g}$
  • B$4.8\,\text{g}$
  • C$7.2\,\text{g}$
  • D$14.4\,\text{g}$

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