 Okay, so let's try another one of these that says calculate the degree of unsaturation in the following formula for DDT. It's C14H9Cl topic. Okay, so what's the first thing we want to do here? See the CLs. Okay, so we got CLs there, we got five of them, what are we going to do? We're going to add the five to the hydrogen. So the hydrogens, right? So that means the new formula or the new base formula is going to be what? E14H14. Okay, so is that formula of a saturated hydrocarbon? No. No, not even close, right? So what do we need to use in order to do that? We use the formula. Which is? CnH2n plus 2. Okay, and so what would the formula be if it were saturated? C14. What? H? H14 times 2. 2 times 14 is 2. Which is what? H would be 30. 30, right? Okay, so what are we going to do now? Subtract the C. Very good, yes. So subtract C14H14 from that. Okay, and remember C is always cancelled out. So how many H's do we have now? 16. 16. So how many units does that translate to? We have eight degrees. Yeah, eight degrees or eight units. That's that integration. I think that's all it asks us, huh? Mm-hmm. But that's a good one. Good job.