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Answer :
Final answer:
To calculate the number of moles of CaCO3 in the sample, divide the mass of the sample by the molar mass of CaCO3. The molar mass of CaCO3 is the sum of the atomic masses of calcium, carbon, and oxygen. In this case, the sample contains 0.393 moles of CaCO3.
Explanation:
To calculate the number of moles of CaCO3 in the sample, you need to use the formula: Moles = Mass / Molar Mass. The molar mass of CaCO3 can be calculated by adding up the atomic masses of calcium (Ca), carbon (C), and oxygen (O).
The atomic masses of Ca, C, and O are approximately 40.08 g/mol, 12.01 g/mol, and 16.00 g/mol, respectively. Therefore, the molar mass of CaCO3 is:
40.08 g/mol (Ca) + 12.01 g/mol (C) + (16.00 g/mol (O) * 3) = 40.08 g/mol + 12.01 g/mol + 48.00 g/mol = 100.09 g/mol
Using this molar mass, you can calculate the number of moles of CaCO3:
Moles of CaCO3 = 39.4 g / 100.09 g/mol = 0.393 moles of CaCO3
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