00:01
In this problem, we're asked to find the mass percent of each atom in aluminum sulfate.
00:13
And let me begin.
00:15
I like to do my mass percents like this.
00:18
Write down each of my substances.
00:21
Atoms, i should say.
00:23
Write on how many of each.
00:26
Multiply these values by the molar mass.
00:31
Let's get the mass.
00:35
Going to a periodic table here.
00:37
Oh, let me make this bigger.
00:42
Okay, there we go.
00:43
26 .982, sulfur 32 .08, oxygen 15 .999.
01:00
These are all grams per mole.
01:07
And we can think of our numbers as moles.
01:13
So let's do these...