Chemistry 0620 · IGCSE · The mole and the Avogadro constant

The mole and the Avogadro constant — practice question

The reaction equation for the thermal decomposition of ammonium carbonate, $(\text{NH}_4)_2\text{CO}_3$, is given below. $(\text{NH}_4)_2\text{CO}_3(s) \rightarrow 2\text{NH}_3(g) + \text{CO}_2(g) + \text{H}_2\text{O}(l)$. $[M_r:(\text{NH}_4)_2\text{CO}_3 = 96]$. A total gas volume of $360\,\text{cm}^3$ is formed at r.t.p. What mass of ammonium carbonate, $(\text{NH}_4)_2\text{CO}_3$, has decomposed?

  • A$0.24\,\text{g}$
  • B$0.48\,\text{g}$
  • C$0.96\,\text{g}$
  • D$1.44\,\text{g}$

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