25 gram limestone (CaCO3) is heated to give 10 gram CaO in a chemical reaction what will be the percentage yield of this reaction CaCO3-----CaO+CO2
Correct answer: D. 71
- A. 75
- B. 40
- C. 56
- D. 71
Explanation
Mr of CaCO3 => 40 + 12 + (3x16) => 100g/molMr of CaO => 40 + 16 => 56g/molCaCO3-----CaO+CO2100g. 56g25g. xgx= 14gPercentage yield = (Actual Yield / Theoretical Yield) × 100 = 10/14 x 100 = 71%
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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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