Magnesium carbonate (MgCO3) and calcium carbonate (CaCO3) both decompose when he

Question

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 CO2, 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? (HINT: The fact that the sample loses 47% of its mass does not depend on the original sample size, only on the relative amounts of the two carbonates. So you can start with any size sample you’d like.)

Explanation / Answer

Magnesium carbonate (MgCO3) and calcium carbonate (CaCO3) both decompose when he

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