Calcium carbonate thermally decomposes to make calcium oxide and carbon dioxide. CaCO3 → CaO + CO2 Calculate the mass of calcium carbonate needed to make 209g of calcium oxide. (A r: Ca = 40.1, C = 12.0, O = 16.0). Give your answer to 3 significant figures. Mass of calcium carbonate – 7554

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1. Mr of CaCO₃ = 100.1 and Mr of CaO = 56.1
   Mass of CaCO₃ = 100.1 / 56.1×209=372.92 g
   To 3 significant figures = 373 g

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