By heating 25g of limestone (CaCO3) , the weight of carbon dioxide produced is:
Correct answer: C. 11 g
- A. 14 g
- B. 71 g
- C. 11 g
- D. 2 g
- E. 10 g
Explanation
Limestone is primarily composed of calcium carbonate (CaCO3). When heated, it decomposes according to the reaction:CaCO3 --> CaO + CO2From the stoichiometric relationship, 100g of CaCO3 decomposes to produce 44g of CO2. Therefore, for 25g of CaCO3, the amount of CO2 produced is calculated as follows:(25g CaCO3 / 100g CaCO3) * 44g CO2 = 11g CO2Thus, the correct answer is 11g. Other options either overestimate or underestimate this calculated mass based on incorrect stoichiometric assumptions.
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About Fundamental Concepts of Chemistry
Mole calculations connect mass, number of particles and Avogadro's number, while balanced equations provide the mole ratios used in stoichiometry. Questions cover limiting and excess reactants, theoretical yield and percentage yield, including identifying which reactant is consumed first and comparing the actual product with the maximum possible product.
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