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Sulfur dioxide is removed from flue gases using the reaction:
CaCO3 + SO2 → CaSO3 + CO2
Calculate the mass of calcium carbonate needed to remove 1.00 tonne (1.00 × 106 g) of sulfur dioxide. Give your answer to 3 significant figures. (Mr: SO2 = 64.1, CaCO3 = 100.1)