 OK, so let's try this problem here. It says to convert the following structures into molecular formulas. And it gives you these three compounds here. The first one is the active ingredient in aspirin, acetylsilic acid. And then the second one here is the active ingredient in Tylenol, acetaminophen. And then this third one here is the elicit narcotic cocaine. So they're all kind of have amalgysic properties. So whenever you're trying to determine from the structure to the molecular formula, the way I like to do it first is to count the carbons. So like we've been doing, it goes C, H, and then in alphabetical order all the heterologues. So since there's only C's, H's, and O's in this one, we're not going to have to worry too much about that alphabetizing. But anyways, so how many carbons do we have? 1, 2, 3, 4, 5, 6, 7, 8, 9. OK, so remember that one. A lot of people are going to forget that. 9. Now we'll count the H's. So 1, 2, 3, no H's, no H's, no H's. 4, 5, 6, 7, 9, 8, right? And then just the O's. How many O's do we have? 4. 4. All of them are in picture. Remember, all hetero atoms and their hydrogens that are attached to them are always picture. So let's look at a C to benefit now. So first, we're going to count carbons. How many carbons do we have in that? So we've got 6, 7, 8, right? How about hydrogens? You have that yet? 9. 9? OK, so let's see. 1, 2, 3, 4, 5, 6, 7, 8, 9. Is that all of them? And then what's next? What atom will we put next? Nitrogen, right? Because that comes with O or hydrogen. And there's only one of them. So that's N. And then O. How many of those? 2. 2 O's. O2. So any questions on the alphabetizing portion? And then let's do this last one. So it's a little more difficult. So I'm going to point out the carbons to you. And you can help me out with some other portions of it. So carbon, let's rip it down first. So what do we have? 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17. So did we miss any carbons? Did we miss any of them? I think we got all two. OK, so this is the portion where a lot of people, and sometimes even Professor Ithas, have a problem with counting it. So you've got to make sure you get every one of the little 8x's are at the end of a line. So if I miss any, let me know. So I'll be the one counting them. And you tell me you skipped one or something like that. So 1, 2, 3, 4, there's only one there. 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 20. Everybody get those? All those sides, too? 21. And then what's next? And just one. And then what? 0, 4, OK? So those are the molecular formulas for acetylsalicylic acid, acetaminophen, and cocaine. OK, are there any questions about doing this? Wonderful. Not too bad. You just got to kind of remember where everything and what everything means with the bond line structures.