Chemistry 0620 · IGCSE · The mole and the Avogadro constant

The mole and the Avogadro constant — practice question

When calcium carbonate is heated strongly, it decomposes. $\text{CaCO}_3\text{(s)} \rightarrow \text{CaO(s)} + \text{CO}_2\text{(g)}$. How many gaseous molecules are formed if 10.0 g of calcium carbonate undergoes complete decomposition?

  • A$1.00 \times 10^{22}$
  • B$1.20 \times 10^{23}$
  • C$6.02 \times 10^{22}$
  • D$6.02 \times 10^{23}$

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