00:01
All right, so we want to know the number of oxygen atoms in 47 .6 grams of aluminum carbonate.
00:07
So the first thing we have to do is convert the grams into moles.
00:13
So we have 47 .6 grams of our aluminum carbonate.
00:20
We're told the molar mass is 233 .99 in one mole.
00:33
Now, that converts from grams into moles, but we don't want to know about moles, we want to know about atoms.
00:42
Now the first thing we have to do is convert into molecules or formula units, and one mole is also avagadro's number, or 6 .02 times 10 to the 23rd.
00:54
I'm going to use the technical term here, a formula unit, but you might be using molecule when it comes to aluminum carbonate.
01:02
That's the number of formula units or molecules in one mole.
01:07
But that, our formula unit here, is for aluminum carbonate.
01:13
And when you look at aluminum carbonate, there's a co3 of carbonate and there's three oxygens in the carbonate.
01:19
And there's three carbonates in the molecule.
01:22
So what that means is that there's actually nine oxygens in there...