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Molar mass of CaCO3 = 66.1221g CaCO3/mole CaCO3. This means that

1 mole CaCO3 = 66.1221g CaCO3.

To find the mass of 4.5 mole CaCO3, complete the following calculation:

4.5g CaCO3 X 1mol CaCO3/66.1221g CaCO3 = 0.068 mole CaCO3.

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