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Chemistry 9 Online
OpenStudy (anonymous):

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 equation is: MgCO3(s) + 2HCl (aq) --> MgCl2(aq) + H20(l) + CO2(g)

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