00:02
Hi there.
00:03
In this question, we have aluminum sulfate having the formula al2, s .o4, 3.
00:12
And we want both the formula weight and the molar mass.
00:17
Well, the formula weight is the weight or mass of one unit, one formula unit.
00:34
And that would be in the units amu.
00:44
While the molar mass is the mass of one mole of the substance in grams.
01:02
So these two sound a bit different.
01:05
However, numerically, they are the same.
01:09
Numerically, the formula weight and the molar mass will be the same number.
01:13
It's just that the formula weight will be an amu, while the molar mass will be in grams.
01:18
And we calculate this number by using the periodic table.
01:22
We use the masses of each substance from the periodic table.
01:25
So this substance is composed of aluminum, sulfur, and oxygen.
01:30
As we look at the formula, there are two aluminum, there are three sulfur, and there's three times four or 12 oxygen.
01:39
So looking at the periodic table, each aluminum is 26 .98.
01:47
And if we're just working on the formula weight here, that would be amu...