Pure CO2 can be prepared by treating limestone with aqueousH2SO4. Limestone contains CaCO3 and MgCO3 and the remaining is insoluble matter. The acid is 12% H2SO4. The residue composition is as follows: CaSO4 8.56 %, MgSO4 5.23 %, H2SO4 1.05%, Inerts 0.53%, CO2 0.12 %, Water 84.51 %. If during the process the mass was warmed and water vapour were removed. Calculate: (a) Composition of limestone used (b) % excess acid used (c) Calculate the weight and analysis if material distilled from the reaction mass per 1000 kg of limestone treated.