A certain mixture contains only SrCO3 and BaCO3. When 1.60g of this mixture is treated with hydrochloric acid, 0.421g of carbon dioxide gas is liberated. Calculate the mass percentage of each component in the mixture. Reaction of the carbonate with the acid: MCO3(s)+2H(aq)+--->M+2(aq) + H2O(l) +CO2(g). Im completely lost on this problem, its kinda the same as the last I guess. Any help will be appreciated.