Question

What is the molar mass of Al2(SO4)3

Answer 1

Molar mass= 342.15 g/mol

Answer 2

Answer:

341.97 g/mol

Explanation:

Let us first write down the relative atomic masses of all the elements involved. (Please not that these will differ from periodic table to periodic table. Familiarize yourself with the data sheet in your institution)

Al - 26.892

S - 32.066

O - 15.999

From the formula we can see that we

Two aluminium atoms = 26.892*2 = 53.784

Three sulphur atoms = 32.066*3 = 96.198

Twelve oxygen atoms  = 191.988

Add them all up = 341.97

So the molar mass is 341.97 g/mol. The units have to assigned because this is the molar mass. Relative molecular mass has not units