Tablets question?

When a calcium carbonate tablet is ingested, it dissolves by the reaction of stomach acid, which contains Hydrochloric acid. The unbalanced equation for this reaction is ( CaCO3(s) + HCl(aq) ------> CaCl2(aq) + H2O(l) + CO2(g) ). How many calcium carbonate tablets, each containing 500 mg of active ingredient are required to react with 18.5 grams of stomach acid containing 49.5% of HCl by m?