The molar mass of AlCl3 is:
(A) 67.9 g/mol
(B) 106.5 g/mol
(C) 62.5 g/mol
(D) 133.5 g/mol

The molar mass of a compound is calculated by adding up the atomic masses of all the elements present in the compound, multiplied by their respective subscripts.

For aluminum chloride (

3
AlCl
3
​
), you have one aluminum atom (Al) and three chlorine atoms (Cl). Let's look up the atomic masses of these elements:

Aluminum (Al) has an atomic mass of approximately 26.98 g/mol.
Chlorine (Cl) has an atomic mass of approximately 35.45 g/mol.
Now, calculate the molar mass of
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3
AlCl
3
​
:
Molar mass = (Number of Al atoms × Atomic mass of Al) + (Number of Cl atoms × Atomic mass of Cl)
Molar mass = (1 × 26.98 g/mol) + (3 × 35.45 g/mol)
Molar mass = 26.98 g/mol + 106.35 g/mol
Molar mass = 133.33 g/mol

Since none of the provided options match the calculated molar mass exactly, it appears there might be a typo or error in the options provided. The closest option to the calculated molar mass is option (D) 133.5 g/mol, although the actual calculated value is slightly different (133.33 g/mol).