The molecular weight of calcium carbonate (CaCO3) is approximately 100.09 g/mol.
This value is calculated by summing the atomic masses of its constituent elements. Calcium (Ca) has an atomic mass of about 40.08 g/mol, carbon (C) has an atomic mass of about 12.01 g/mol, and oxygen (O) has an atomic mass of about 16.00 g/mol. Since there are three oxygen atoms in the formula, you multiply the atomic mass of oxygen by three.
Thus, the calculation looks like this:
40.08 (Ca) + 12.01 (C) + 3 * 16.00 (O) = 100.09 g/mol.
This molecular weight is important in fields like chemistry and biology, where it helps in calculations involving stoichiometry and chemical reactions.