%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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