Here's how to calculate the molar mass of aluminum chloride (AlCl₃):

* Find the atomic masses:

* Aluminum (Al): 26.98 g/mol

* Chlorine (Cl): 35.45 g/mol

* Multiply the atomic mass of each element by its subscript in the formula:

* Aluminum: 26.98 g/mol * 1 = 26.98 g/mol

* Chlorine: 35.45 g/mol * 3 = 106.35 g/mol

* Add the results together:

26.98 g/mol + 106.35 g/mol = 133.33 g/mol

Therefore, the molar mass of aluminum chloride (AlCl₃) is 133.33 g/mol.