Chemistry 0620 · IGCSE · Relative masses of atoms and molecules

Relative masses of atoms and molecules — practice question

During the thermal decomposition of 12.5 g of limestone (impure calcium carbonate), 5 g of calcium oxide are obtained. What mass of calcium oxide would be obtained from the thermal decomposition of 30 g of limestone?

  • A6 g
  • B12 g
  • C15 g
  • D24 g

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