Chemistry 0620 · IGCSE · The mole and the Avogadro constant

The mole and the Avogadro constant — practice question

Chlorine gas reacts with iron metal. $21.3\,\text{g}$ of chlorine reacts with $11.2\,\text{g}$ of iron. How many iron atoms react with $30$ molecules of chlorine?

  • A$10$
  • B$15$
  • C$20$
  • D$30$

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