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

Atoms, molecules and stoichiometry — practice question

$0.144\text{ g}$ of an aluminium compound X is reacted with excess water, producing a gas. This gas then burns completely in $\text{O}_2$ to give $\text{H}_2\text{O}$ and only $72\text{ cm}^3$ of $\text{CO}_2$. The volume of $\text{CO}_2$ was recorded at room temperature and pressure. What could be the formula of X? [$\text{C} = 12.0$, $\text{Al} = 27.0$; $1$ mole of any gas occupies $24\text{ dm}^3$ at room temperature and pressure]

  • A$\text{Al}_2\text{C}_3$
  • B$\text{Al}_3\text{C}_4$
  • C$\text{Al}_4\text{C}_3$
  • D$\text{Al}_5\text{C}_3$

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