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

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To find the mass percent of CaCO3 in the original mixture, first note that the initial mass of the mixture is 0.656 g and the remaining mass of CaO after heating is 0.485 g. The difference in mass indicates the amount of CO2 produced during the decomposition of CaCO3. Using stoichiometry and the balanced reaction equation, the mass of CaCO3 can be calculated, leading to the conclusion that the mass percent of CaCO3 in the mixture is 59.3%. This calculation demonstrates the relationship between the initial and final masses in the reaction.
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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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