 Okay, so let's analyze this same paper process again, but this time we're going to look for the crossover temperature. So remember, just like what we were saying, whenever the signs are the same for entropy and enthalpy, right, we can find a crossover temperature. So what does the crossover temperature mean again, guys, where the reaction goes from what to what? Spontaneous to non-spontaneous. Yeah, very good. Spontaneous to non-spontaneous. So that's what we're going to figure out right now, what is that crossover temperature, okay? So temperature crossover equals what, what's up here? Delta H or enthalpy, and down here, Delta S or entropy, okay? But notice these units, right, are not the same units, so we're going to have to convert either joules to kilojoules or kilojoules to joules. What temperature units would we be expecting this to be in, Kelvin, okay? So let's think about that and put this all together. So I'm just going to convert joules to kilojoules, okay? So at the top I put negative 92.2 kilojoules, and then I divide that by, we get 199 joules per 1 Kelvin, and then again, like I said, I want to convert that to kilojoules. So 1,000 joules, 1 kilojoules, is everybody okay with me doing that? Okay, I want to pull this cancel at our units, so joules cancel with joules there, kilojoules cancel with kilojoules there, and if I have 1 divided by something, divided by something else, like Kelvin here, that Kelvin's going to go up to the top, remember that, okay? So it's a good thing we have a negative there and a negative there, because temperature here cannot be what kind of numbers, negative numbers, so they've got to cancel out. Why can't they be negative numbers? Kelvin's always positive, okay, and Kelvin is always positive. So let's just plug and shut it down, so I'll do, I do like to do the bottom first, so 199 divided by 1,000, and then say 92.2 is the answer, and three sig figs, three sig figs, so our answer is to three sig figs, so I got 463 Kelvin, and then of course if it asks you to convert it to degrees Celsius or degrees Fahrenheit, you know how to do that already, okay? So are there any questions about this? Huh? Oh wait, no. Wait, what do we just say about negative? It has to be positive. It has to be positive. Okay. Any more questions? Okay, wonderful. Okay. Okay. Okay. Okay. Okay. Okay. Okay. Okay. Okay. Okay. Okay. Okay. Okay. Okay. Okay. Okay. Okay. Okay.