So in this problem, we're going to be looking at the reaction of copper two sulphate and copper, two sulphate Penta hydrate. We've got a mixture of these two samples and our total mass is 1.245 grams. So again, we've got 1.245 g, and part of it is anhydrous copper, two sulphate. And part of it is, um, competence sulphate Pantai Drake. After we drive off all of the water, we have a mass of 0.832 g. We're gonna find the mass percent of the copper two sulphate, and to hydrate in the mixture. Okay, there we go. We're going to do massive water. Two moles of water, two moles of copper, two sulphate Pento hydrate. I excuse me. Two moles of copper, two sulphate and bent hydrate to massive copper. Two sulphate Penta hydrate. Then we're gonna divide that by the mass of the sample and that will tell us are percent. And I think we're ready to begin putting together our calculation with a lovely shade of purple. So the mass of water driven off is gonna be 1.245 g. Are mixture minus the dry and hydra sample. We get 0.413 g of water. Now we're going to convert 0.413 g of water, two moles of water by dividing by the molar mass of water, which is 18.2 grams per mole. Our answer is 0.2 to 9 bowls of age to out. Our next step is to convert that bulls of H 20 the moles of copper two sulphate Penta hydrate. And we're going to do that with simple mole ratio. This is easy. Look, we have five there, so we're gonna use our coefficients of one and five and we get zero point. That's not right. 0.0 zero for five. You have to get a little bit more room here. Can't right all the way to the edge of the paper. Here we go. 0.0 zero for 584 malls of the Penta Hydrate. Okay, and then we're gonna be going to our next page transcribe this information on to this page. This is how many moles of the copper two sulphate pento hydrate we have now We're going to convert this to mass of copper. Two sulphate Penta hydrate by multiplying by the molar mass of the copper. Two sulphate Penta hydrate is to 49.68 g per mole and we have 1.144 g of copper. Two sulphate Penta hydrate. Almost done. Now we're simply going to divide. I should have written Pento hydrate right there. 1.144 g, divided by 1.245 g equals 91.9% C. U. S 04 got five h 20 and that's the answer.