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To determine the molar mass of calcium carbonate (CaCO3), you need to consider the individual atomic masses of each element in the compound and then sum them up according to the formula.

Calcium (Ca) has an atomic mass of approximately 40.08 g/mol. There is one calcium atom in each formula unit of calcium carbonate.

Carbon (C) has an atomic mass of about 12.01 g/mol. There is one carbon atom in the formula.

Oxygen (O) has an atomic mass of around 16.00 g/mol. There are three oxygen atoms in calcium carbonate, so you would multiply the atomic mass of oxygen by three.

Calculating it step-by-step:

1. For calcium: 1 x 40.08 g/mol = 40.08 g/mol

2. For carbon: 1 x 12.01 g/mol = 12.01 g/mol

3. For oxygen: 3 x 16.00 g/mol = 48.00 g/mol

Now, add these values together:

40.08 g/mol (from Ca) + 12.01 g/mol (from C) + 48.00 g/mol (from O) = 100.09