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Work out the Mr for CaCO3, which is 100.1gmol-1. Use this to work out the number of moles using the equation n=m/Mr, which is 2.3g/100.1gmol-1 = 0.02977 mol. Next work out the ration of CaCO3 to HCl which is 1:2. Therefore the number of moles of HCL is
