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Homework Help: Stoichiometry Help

  1. Sep 19, 2008 #1
    1. The problem statement, all variables and given/known data

    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.

    2. Relevant equations

    3. The attempt at a solution

    I have no clue how to start this off. The answer is 59.3
  2. jcsd
  3. Sep 20, 2008 #2


    User Avatar

    Staff: Mentor

    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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