 Okay, so let's try to rate these following compounds from highest to lowest boiling point. So I guess if we're starting with the highest boiling point things, the first thing we want to do is distinguish between organic and inorganic compounds, okay, or covalent and ionic compounds if you want to think about it on that. So the covalent compounds are always higher boiling point, okay, so they've got like boiling points in the thousand degrees, something like that. And then we've got to ask ourselves, what's the molecular weight of those two, right? So KCl is higher than NACL, so we go KCl, NACL, so this is first, highest, second. And now when we look at the other four molecules here, we see that these three, C6H14, C16H38, and CH4 are all hydrocarbons, so it means they're all non-polar, okay? Non-polar things always have lower boiling point than polar things, okay? So water actually is very, very polar. So it's going to be the next highest boiling point thing, but they're always higher. Is it better than which one is more? This one's a higher molecular weight than this one, okay? And then we got here the last thing, since they're all hydrocarbons, we need to think about molecular weight. So which one's the highest in molecular weight? It's this one. This one's the next highest in boiling, C16H38, C6H14, and then finally CH4, okay?