Limestone (CaCO3) is used to remove acidic pollutants from the smokestack flue gases. It is heated to form lime (CaO), which reacts with sulfur dioxide to form calcium sulfite. Suppose a 70.0% yield in the overall reaction, determine the mass of limestone is needed to remove the entire sulphur dioxide produced by the combustion of 8.5 X 104kg of coal that is 0.33mass % sulphur.