The molar mass of barium carbonate (BaCO3) can be calculated by adding the atomic masses of its constituent elements. Barium (Ba) has an atomic mass of approximately 137.33 g/mol, carbon (C) has an atomic mass of about 12.01 g/mol, and oxygen (O) has an atomic mass of approximately 16.00 g/mol.
Since there is one barium atom, one carbon atom, and three oxygen atoms in barium carbonate, we can calculate the total molar mass as follows:
Molar mass of BaCO3 = (1 × atomic mass of Ba) + (1 × atomic mass of C) + (3 × atomic mass of O)
Molar mass = (1 × 137.33 g/mol) + (1 × 12.01 g/mol) + (3 × 16.00 g/mol)
Molar mass = 137.33 g/mol + 12.01 g/mol + 48.00 g/mol
Molar mass = 197.34 g/mol
Therefore, the molar mass of barium carbonate is approximately 197.34 g/mol.