00:01
Okay, so if i have 100 grams of whatever this is, then if 38 .72 % is carbon, i would have 38 .72 grams of carbon.
00:14
I would have 9 .62 grams of hydrogen.
00:21
I would have 51 .6 grams of oxygen.
00:28
Now let's figure out the number of moles.
00:30
So we know, let's start with carbon.
00:34
We know that carbon has 12 .01 grams per mole.
00:38
So we do 38 .72 divided by 12 .01.
00:43
Let's see how many we get.
00:47
We get 3 .225 moles.
00:55
Then let's do the same thing for hydrogen.
00:57
So we have 9 .62 divided by 1 .008 grams per mole.
01:08
And we end up getting 9 .543 moles.
01:19
Then we do it for oxygen last, and we have 51 .6 grams.
01:24
We divide by 16 grams per mole, and let's see what we get.
01:38
We get 3 .225 moles of oxygen.
01:44
Now we need to figure out the ratio of the moles of all of the elements.
01:48
So what we're going to do is look for the one with the smallest mole value.
01:53
And that was our 3 .225, which happened to be the same for carbon and for oxygen.
01:57
So we're going to divide each of these.
01:59
So carbon, we do 3 .225 divided by 3 .225.
02:04
We do the same thing for oxygen.
02:06
And for hydrogen, we do 9 .543 divided by 3 .225.
02:12
So we get one for carbon, oxygen for the same reason, one...