The molecular weight of calcium carbonate CaCO3 is:A. 80B. 90C. 100D. 110

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The molecular weight of calcium carbonate CaCO₃ is:
A. 80
B. 90
C. 100
D. 110

see full answer

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Detailed Solution

The molecular mass of a substance is calculated by adding up the atomic masses of all the atoms in a molecule. The unit for molecular mass is grams per mole (g/mol). For example, the molecular weight of water (H₂O), which consists of two hydrogen atoms and one oxygen atom, is 18 g/mol. This is calculated as 16 (oxygen) + 2 (hydrogen).

To calculate the molecular weight of calcium carbonate (CaCO₃), we sum the atomic masses of calcium, carbon, and oxygen, each multiplied by their respective stoichiometric coefficients.

The atomic masses are as follows: