The mineral magnesite contains magnesium carbonate, mgco3 (molar mass= 84 g/mol), and other impurities. when a 1.26-g sample of magnesite was dissolved in hydrochloric acid, 0.22 g of co2 was generated. if the magnesite contained no carbonate other than mgco3, what was the percent mgco3 by mass in the magnesite? the reaction is as follows:
mgco3(s) + 2hcl (aq) --> mgcl2(aq) + h20(l) + co2(g)