 OK. So let's try another one of these problems. It says, complete the following reaction and write the major product, OK? So our major products in this case. So the first thing I'd like to do is, well, when I see alkane or any organic molecule and I'm reacting with oxygen, what kind of reaction do we call it? Combustion. It's a combustion reaction, OK? So remember, for combustion reactions, the products are always the same, right? What are those products? CO2. OK, CO2 and what? H2O. And what? Yeah. OK, so the actual problem here is not deciding what the products are, but really is to do what to this reaction? We'll balance it. We've got to balance it, OK? So let's draw our little lines, like we like to do. OK, so you've got the products, right? What I would like to do here is, because it doesn't matter what the structure is, it really will move the molecular formula back. So let's figure out what the molecular formula of this is. What is that? H, what should it be? CnH2n plus 2, right? What should it be? 12. 12, right, OK? Remember, that's an alkane, OK? So C5H12, I'm going to erase this up here. Can I erase that one and write C5H12? And then just approve to ourselves if the structure doesn't matter. So when you see those structures, if it's a combustion reaction and it freaks you out, just write the molecular formula that makes it this way. So now we just do the normal process where we balance, right? So what are we going to do? C, H, O, C, H, O. How many C's? Five. Five. How many H's? 12. 12. Of course, how many O's? Two. And then what do we have here? C's, one, H's? Two. Two. And O's? Three. Three, OK? So five, well, 1 times 1 equals 5. 5. 5, OK? So C5, we're going to put a 5 there, OK? What about 12? 1 times 2 equals 12. 6. OK? So we're going to put a 6 over there, OK? So why didn't we do that? Because now we have 5 C's, and 2 times 6 equals 12 H's, OK? And we have the same over here. But now our oxygens are balanced, right? Because over here we have 2, but here we have how many now? We have 16. Yeah, so 2 times 5 is 10, plus 6 is 16. So let's erase this one. We're no longer looking at 3. We're looking at 16. So what do we got to do over here to 2 to make it 16? We'll do 5 by 8. 5 by 8, OK? And that equals 16, OK? So let's put an 8 here. OK, and let's just check ourselves again. So five carbons, five carbons. That checks out, right? 12 pyrogens, 12 pyrogens, that checks out. 16 oxygens, 16 oxygens, that checks out. So remember, every time, so good job, this is the right answer, OK? So remember, every time you're doing these combustion reactions, you want to put your CHO here, CHO here, then balance the season H's over here, OK? And whatever the O's give you, you write that down here, then go back here and balance the O's, OK? Any questions on it? OK, wonderful. Any questions? Questions? Yeah? I don't know where you want to do this, so. OK. Adnan, is it on this question here? No. OK, we're recording this question, right? Oh, sorry. That's all right. So are we done with this one, then? Yeah. OK, wonderful. Any other questions on this one? OK, wonderful.