Methionine, one of the 20 amino acid building blocks from which proteins are made, has the following structure. What is the chemical formula of methionine? In writing the for-mula, list the element symbols in alphabetical order, and give the number of each element as a subscript.

Video transcript

Hello. Everyone in this video, we're given the structure of your jean right over here trying to determine the chemical formula of your routine and we have to list the elements alphabetically with the correct subscript. So here what we see in the structure is a skeletal formula where all the carbons and the hydrogen is connected to them are not shown. So only the elements different from carbon and the hydrogen is connected to them can be represented. That's why we see our nitrogen and our oxygen's all right. So let's go ahead and just felt the carbs and high regions and we can count the number of each element and write a chemical formula of your Dean. Alright, so in red I go ahead and write out the carbons. Carbons can be found in any of our sort of kinks. I call it starting over the left side. We have this carbon here, just going right around the ring. We have another carbon here here and here. Now moving on to the middle of this molecule, we have one carbon here and moving around this five member ring. We have carbon here here here or to the right we see this longer branch here. We also have another carbon here. So sort of any corner and little king that we have. We have a carbon. So now of course we know that carbon is like to have four different bonds or four bonds. It can be triple bond, it can be double bond or it can be a single bond. It just needs to fulfill its octet. So we can go ahead and fulfill its octet by having higher regions who see that The two carbons carbons do have its octet because it has four bonds. This is a carbon steel carbon here. So we have 12 bonds for coming from the double bond then we have three and four. So these two carbons here do not need any hydrogen to fulfill its octet, but the other carbons in this ring do so we need one hydrogen here and one hydrogen here and moving on to the middle of our molecule here. We also have three bonds here, looks like it's like that for the rest of the five member ring. So we can go ahead and add a hydrogen for all of these carbons. All right now moving on to this sort of longer branch here of this memory memory ring. We see that we have only two bonds connected to this carbon. So we need of course to higher regions. All right, so let's start counting the number of each element starting off with writing kind of what molecules are elements that we see in this molecule. We see we have oxygen, hydrogen carbons and nitrogen. So putting it alphabetical order, it would be C then h then n. And lastly. Alright. So now we go ahead and sort of count each element that we have and figure out what the formula is. Alright, starting off with the C. Then we have and nine. We have nine carbons. Moving on to eight. So high jeans, we have 123456789, 10, 11 and 12. We have 12 high regions here in this molecule, we're going on to nitrogen. We have just one here and one here. So we have a total of two nitrogen. And for oxygen we have, let's see. We have and six. We have a total of six. So my after counting the number of each element in the president in this molecule, we get that. My final answer for the chemical formula of your team is C nine, Age 12 and two oh six. So this right here is going to be my final answer for this problem. Thank you all so much for watching.