Mr(Ca CO3)

To calculate the molar mass (Molar mass = Mr) of calcium carbonate (CaCO₃), you can add the atomic masses of each element in the compound:

1. Calcium (Ca): Approximately 40.08 g/mol
2. Carbon (C): Approximately 12.01 g/mol
3. Oxygen (O): Approximately 16.00 g/mol

Calcium carbonate consists of one calcium atom, one carbon atom, and three oxygen atoms. The calculation is as follows:

\[ \text{Mr (CaCO}_3\text{)} = (1 \times 40.08) + (1 \times 12.01) + (3 \times 16.00) \]

Calculating this gives:

\[ \text{Mr (CaCO}_3\text{)} = 40.08 + 12.01 + 48.00 = 100.09 \text{ g/mol} \]

Thus, the molar mass of calcium carbonate (CaCO₃) is approximately 100.09 g/mol.