APFIVE Stoichiometry of a Mixture Decomposition
A 0.500 g mixture of MgCO₃ and CaCO₃ is heated until complete decomposition occurs via $$\mathrm{MCO}_3(s) \rightarrow \mathrm{MO}(s) + \mathrm{CO}_2(g)$$. If 0.224 g of CO₂ is produced, what was the mass percentage of MgCO₃ in the original mixture?
A
21.5%
B
38.2%
C
10.0%
D
44.8%
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