 An ore sample is known to contain copper sulfate pentahydrate. If a 10.000 gram sample of the ore loses 0.5728 grams of water when heated strongly, what is the maximum quantity of copper sulfate pentahydrate that can be in the sample? So it's very similar to the last problem we just did. So let's write down what we know. So it gives us copper 2 sulfate pentahydrate. Well, it gives us the formula, but we can pretend it didn't. So copper 2 sulfate. And then remember pentahydrate. It's going to be pentas 5. And hydrate, of course, is 1. And it also tells us that they heated strongly. So let's write that chemical equation. So we should be pretty good at these by now. And this goes away. Okay, so let's write the initial mass of the ore. The passive water that it loses is 0.5728. And it's asking us, well, what's the maximum amount of copper 2 sulfate pentahydrate that you could have? So first thing we're going to have to do is figure out the number of moles of water that we got. You want to do these into a lot of steps. You can do that, or you can break them up into little steps. What's the number of moles of this copper sulfate pentahydrate that we had? So we know that for every 5 moles of water, we have one mole of the copper sulfate pentahydrate, moles of copper 2 sulfate pentahydrate. But we're not looking for that. We're looking for the maximum, right? So calculated this. Yeah, 1.59. 0.5. 6-2. 6-2. And that's with the waters on there. No. It gives it to you. Huh? It gives it to you on that sheet. Oh, what is it? 9.55. What is it? 2.49. So that's going to give us now the mass of the hydrate. So that's almost what we're looking for. So let's just calculate that out. So I'm just going to go to whatever, right now, grams of the copper 2 sulfate pentahydrate. That's what we're looking for, right? Let's say what's the percentage of the sample, right? That's it. That's the answer, right? So let's just put it to the right number of sig figs, and then we're cool. So we started with four sig figs. So yeah, that's essentially the theoretical yield, the maximum amount that could be. So if you hear that, maximum amount or theoretical yield. So that's a good question. It's the same thing. Any questions on that one? Make sense? Yeah. Thank you.