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Dolomite is a mixed carbonate of calcium and magnesium that decomposes to CO2 and the metal...

Dolomite is a mixed carbonate of calcium and magnesium that decomposes to CO2 and the metal oxides MgO and CaO upon heating. When 11.15 g of dolomite is heated, 5.70 g of MgO and CaO are produced. What is percent by mass of MgCO3 in the original sample of dolomite?

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