Final answer:
The relative formula mass of aluminum sulfate is 342.14 amu.
Step-by-step explanation:
The relative formula mass of aluminum sulfate can be calculated by finding the atomic mass of each element in the compound and multiplying it by the number of atoms present in the formula. The formula for aluminum sulfate, Al2(SO4)3, indicates that it contains Al³+ and SO4²- ions combined in a 2:3 ratio. The atomic masses of sulfur and oxygen are 32 and 16 amu respectively.
Therefore, the relative formula mass can be calculated as follows:
[2(atomic mass of aluminum) + (3 x atomic mass of sulfate)]
= [2(27 amu) + 3(32 + 4(16) amu)]
= 342.14 amu