Chemistry 0620 · IGCSE · Relative masses of atoms and molecules

Relative masses of atoms and molecules — practice question

The relative formula mass, $M_r$, of calcium carbonate, $\text{CaCO}_3$, is 100. What mass of carbon is contained in $100\,\text{g}$ of calcium carbonate?

  • A$12\,\text{g}$
  • B$36\,\text{g}$
  • C$40\,\text{g}$
  • D$60\,\text{g}$

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