Chemistry 0620 · IGCSE · The mole and the Avogadro constant

The mole and the Avogadro constant — practice question

Phosphorus combines with oxygen to produce phosphorus(III) oxide, as shown below. $4\text{P}(s) + 3\text{O}_2(g) \rightarrow 2\text{P}_2\text{O}_3(s)$ What mass of phosphorus(III) oxide is formed from $6.2\,\text{g}$ of phosphorus?

  • A$1.1\,\text{g}$
  • B$5.5\,\text{g}$
  • C$11.0\,\text{g}$
  • D$22.0\,\text{g}$

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