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### Propane is widely used in liquid form as a fuel f…

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University of Toronto

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Problem 27

Iron reacts slowly with oxygen and water to form a compound commonly called rust $\left(\mathrm{Fe}_{2} \mathrm{O}_{3} \cdot 4 \mathrm{H}_{2} \mathrm{O}\right) .$ For 45.2 $\mathrm{kg}$ of rust, calculate (a) moles of compound; (b) moles of $\mathrm{Fe}_{2} \mathrm{O}_{3} ;(\mathrm{c})$ grams of $\mathrm{Fe} .$

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## Video Transcript

So for Waas the, um, chemical formulas f eet you'll flee with four war. I assume we have 45 points. You kill Graham. We have to find out a the moan of almost a compound will be the waas Be with a number of more evolve iron to ah oxide And also see the mass off our Indian terms off grand. Okay, first of all, that's fired. Ah, number move off our compound. So again we want to find them all to myself. Ah, there. Once we have to go back to a Pulitzer, um, Fatima mess. So, um, so we have to iron. So reaches the to file. I am just really five points a five times to pass a We have free oxygen 16 times. Three. Plus, we have, ah, four water. So, Ah, when you go back to your taxable and you would look for the, um well, the mass off each off the image at them together, you should be able to find that is 50 around, too. Ah, fi went on seven grand for mold. Okay, so the limbo move against the whole compound with 1/2 hour, um, flee 5.2 kilogram again. Where we looking at The limbo. Most equation we're using, Graham. So the key program we have to convert that Thio Graham. So it will be We have to modify the hoping by 1000. So it will be for your five 45 to 45 200 graham. And they were over or over our with a mass off their whole compound. And then, um where we have a limbo Mohs. So it's Ah, it's the Iran 1 95.1 Mole of the compound one, then you 5.1. Okay, so the second question is what would be the lumbar most off Ianto Ox. I'm free oxide. All right, so for each off the, um what's yours? Iwas compound this complex compound for each off them. We will have one. I too, Old flea. We only have one you need. So therefore, the lumber most off our eye until three in the compound will be cost alone. Bohm office compound. So therefore you will be also because the 105 point when press report. Okay, so then what would be the mass off Iine? Um, in that I mean in this compound, so again in this compound? Um, we for each of them we will have to iron. So we're trying to, uh I mean to wine. And the irony is ah ko and 40. So, um, the mass of iron. Everyone did, though. That file that we need to find the lumber almost aren't. So the lumber Moser iron will be coasted out. Total number most would be 1 95 foreign, \$1 for each off them. We have to. So we have 1 95.1 times two 0.1 times two were flee 19.2 miles. All right, so the let's stab us, we're going to convert to the mass. Ah, off. So we just got our own. Bommel's freeing 90.2 multiplied by the molar mass 50 5.85 Actually, it is a 5 90 feet and then you're sending a coke a leader. So time for your 5.5 We will have 2179 glam off our in so and