Calcium carbonate reacts with sulfur dioxide gas and oxygen to produce solid calcium sulfate, carbon dioxide g?

CaCO3(s) + SO2(g) --> CaSO3(s) + CO2(g). 8,000 kg SO2 * 1,000 g / 1 kg = 8,000,000 g SO2. Convert 8,000,000 g SO2 to moles SO2: Moles SO2 = mass SO2 / molar mass SO2 8,000,000 g / 64,066 g mol-1 = 124,870.

From the balanced equation: 1 mole SO2 reacts with 1 mole CaCO3 so 124,870 moles CaCO3 reacted. Convert moles CaCO3 to mass: Mass CaCO3 = moles CaCO3 * molar mass CaCO3 124,870 moles * 100.0869 g/mol = 12,498,000 g 12,498 kg = 12,500 kg to 3 sig fig.

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