 Okay, so let's do another one of these Newman projection strain energy problems. So this one says, compare the total strain, or compute the total strain energy of the following conformation using the values provided in the table. Show complete, show work for complete credit. So here we have what is this 2,3-dimethyl butane. The problem doesn't ask you that, but I have built a model of the Newman projection that we're looking at. Remember, again, you can, and what we're doing here is looking at the rotation about the C2, C3, sigma bond there. So remember it can freely rotate around. And if you look at this conformation, hopefully the first thing you see is that is a really strained conformation. So the first thing I would say is, if you're having a hard time seeing this, build the model. You saw how long it took me to build the model, it wasn't that long. But if you're cool with that, the next question I would have you ask yourself is, is this eclipsed or stagnant? Eclipsed. It's eclipsed. Okay? So remember, the Gauch interaction, that's only in the staggered conformation. So we can kind of eliminate that from our choices. And then we just look for, okay, is there a hydrogen-hydrogen eclipsing? Do you all see one? Yeah, there's one. It's right here. That's what I would do. And I would mark it 4.0. And then hydrogen-methyl eclipsing, no, I don't see one. But I see methyl-methyl eclipsing, right? So a methyl-methyl and a methyl-methyl, they're both 11. And then it says we have to show our calculation. So we'll just say the strain energy, that equals, well, there's 1, 2, 2 times 11.0 kilojoules per mole. Remember we're still in chemistry, so we've got to read our units. And then we're going to add that to 4.0 kilojoules per mole. Is there any questions about what we've done so far? So 2 times 11, that's 22, plus 4, that's 26, right? So 26.0 kilojoules per mole. Fox the thing, so Professor Heath knows which one you want me to look at. Okay, good morning. It's nice to see you. Any questions about this one? Yeah, probably we went over all the questions from last time. Okay, cool. So that's how you do these things. Good luck doing them.