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Limestone(CaCO3) is used to remove acidic pollutants from smokestack flue gases in a sequence of decomposition-combination reactions

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Limestone(CaCO3) is used to remove acidic pollutants from smokestack flue gases in a sequence of decomposition-combination reactions. The limestone is heated to form lime (CaO), which reacts with sulfur dioxide to form calcium sulfite. Assuming a 76.1% yield in the overall reaction, what mass of limestone is required to remove all the sulfur dioxide formed by the combustion of 84000 kg coal that is 0.3 mass % sulfur?