Where did you get the name of calcium trioxocarbonate (vi)? There is no such compound. You may have meant CaCO3 which is properly called calcium carbonate.
CaCO3 + 2HCl ==> CaCl2 + H2O + CO2
mols CaCO3 = g/molar mass = about 30/100 = 0.30
So you can 0.30 mols CaCl2 from 0.30 mols CaCO3.
Calculate the number of moles of calcium chloride that can be obtained in 30g of calcium trioxocarbonate (vi) in the presence of excess hydrochloric acid
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