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In a closed system consisting of 2.00 mol of H2SO4 and 2.00 mol of CaCO3 in a conical flask including a syringe (shown in the diagram below), the following reaction takes place at 25.0 °C and 100 kPa. H2SO4(l) + CaCO3(s) → CaSO4(s) + H2O(l) + CO2(g)