%age of calcium in calcium carbonate is
Correct answer: C. 40%
- A. 80%
- B. 30%
- C. 40%
- D. 20%
Explanation
Molecular formula of calcium carbonate: CaCO₃Atomic masses:Calcium (Ca): 40.078 amuCarbon (C): 12.011 amuOxygen (O): 15.999 amuCalculate the molar mass of CaCO₃:CaCO₃: 40.078 (Ca) + 12.011 (C) + 3 (15.999 O) = 100.087 amuCalculate the mass of calcium in CaCO₃:Ca: 40.078 amu / 100.087 amu (total mass) * 100% = 40.04%Therefore, the percentage of calcium in calcium carbonate is approximately 40%
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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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