The molar mass of magnesium sulfate (MgSO₄) is calculated by adding the atomic masses of its constituent elements. Magnesium (Mg) has an atomic mass of approximately 24.305 g/mol, sulfur (S) has an atomic mass of about 32.06 g/mol, and oxygen (O) has an atomic mass of around 16.00 g/mol. Since there are four oxygen atoms in magnesium sulfate, the total atomic mass for oxygen is 4 × 16.00 g/mol = 64.00 g/mol.
Adding these together: 24.305 g/mol (Mg) + 32.06 g/mol (S) + 64.00 g/mol (O) = 120.365 g/mol.
Therefore, the molar mass of magnesium sulfate is approximately 120.365 g/mol.