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Magnesium carbonate (MgCO3) and calcium carbonate (CaCO3) both decompose when heated, forming CO2 gas and the corresponding oxides.
MgCO3(s) → CO2(g) + MgO(s)
CaCO3(s) → CO2(g) + CaO(s)
When a particular mixture of MgCO3 and CaCO3 is heated, it releases 47% of its mass as CO 2, so that the oxide products have 53% of the mass of the original sample. What mass percentage of MgCO3 was present in the original mixture?
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