Chemistry 9701 · AS & A Level · Atoms, molecules and stoichiometry

Atoms, molecules and stoichiometry — practice question

A $35.6\,\text{g}$ sample of hydrated sodium carbonate has sodium ions making up $25.84\%$ of its mass. On heating this sample, anhydrous sodium carbonate and water are produced. Which mass of water is released?

  • A$7.2\,\text{g}$
  • B$10.6\,\text{g}$
  • C$14.4\,\text{g}$
  • D$21.2\,\text{g}$

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