 OK, anyway, so what does this problem say? How much heat in kilojoules is evolved or absorbed in the burning of 15.5 grams of protein? So well, I guess we can figure out, is it going to be evolved or absorbed? Evolved, how do you know that? Because it's naked, right? So the heat will be evolved. And that means, like, leave the system. Not, like, change it to, like, a dinosaur or something. OK, so we're trying to figure out the number of, or how much heat is evolved in the burning of 15.5 grams of propane. So we know the mass of propane, 15.5 grams. And we want to know the number of moles. So let's change this to 10. And we know the molar mass. We got that a century ago. So the 40.094 grams will cancel. So that is one mole of C3H8. And what else do we know? Because we want to get energy up here, right? So what conversion factor are we going to use? Which is what you guys were saying, right? Like that, right? Because I got one mole to negative 2, 0, 4, 4. So now all we've got to do is plug and check. So it's going to be the 3, 6, 6. So 7, 1, 9 kilojoules of energy is above. That what you guys got? Yes. Good. OK, cool. Let's go up to the lab, guys, and we'll continue this discussion.