What is the mass percent of CaCO3 in a mixture after heating to produce CO2?

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SUMMARY

The mass percent of CaCO3 in the original mixture can be calculated using stoichiometry based on the decomposition reaction of calcium carbonate (CaCO3) into calcium oxide (CaO) and carbon dioxide (CO2). Given a mixture mass of 0.656 g and a remaining CaO mass of 0.485 g after heating, the calculation shows that 59.3% of the original mixture was CaCO3. The balanced reaction equation is essential for determining the relationship between the masses of the reactants and products.

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Homework Statement



mixture of CaCO3 and CaO m=0.656 g, heated to produce CO2. After heating, only CaO solid remains and it weighs 0.485 g.

Assuming all the CaCO3 decomposed to CaO and CO2, calculate the mass percent of CaCO3 in the original mixture.



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The Attempt at a Solution



I have no clue how to start this off. The answer is 59.3
 
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Do it backward, For known amount of CO2 produced, calculate mass of CaCO3 decomposed. This is a simple stoichiometry - start with the balanced reaction equation.
 

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