 Okay, so let's try another eliminating reagent problem. So this time we've been given masses instead of moles. It says how much molten iron is formed from the reaction of 25.0 grams of iron 2 oxide with 25.0 grams of aluminum, okay? So we want to figure out how much molten iron is formed, okay? So what do we need to figure out? Which one is the what? The limiting reagent, okay? So what do we have to do first? We've got masses here, we've got to do what? Convert to moles first, okay? What's on the bottom here? What's on the top? One mole of what? Iron 2 oxide. And what would be the on the bottom? Fifty-five point eight plus sixteen, yeah. Seventy-one point eight five. Okay, so are we at what we want? Moles of iron 2 oxide. Well, what do we have to do then? Motivation. Of what? Iron 2 oxide. So what's on the bottom? Three moles of iron 2 oxide. And on the top? Three moles of iron. Only one person can help me out with this? Anybody else in here? Is there anybody else in this room? Yes. Yes, yes, there's a bunch of people. They can all help me out, okay? Where we want to be? No, no. No, we still want to figure out the what? Mass. Mass, okay. So what if, yes, we use the molar mass. So what do we put on the bottom? One mole of iron. One mole. And on the top? Five point eighty-five grams of iron. Where'd you get that number? Pretty thick. Okay, so let's calculate that. Three sick bigs I get. Nineteen point four grams of iron. Okay, so is that the amount that's produced? Or do we know yet? We don't know yet. We don't know because we have to figure out the other one, right? Okay, so let's do the same thing. So on the bottom, what? Twenty-six point nine eight grams of Al. Somebody else, what's on top? Ladies? One mole. One mole of what? Al, okay? One mole of grains. One mole of Al, okay? So here we are. Cancel, cancel. Now what? Okay, of what to what? What's on the top? Or what's on the bottom? Let's try that one first. Two moles. On the top? Ladies? What's on the top? Three moles of iron. If you're wondering, you can just look up here. It's the same thing, okay? Now what, ladies? Do you want to know? Just do the same thing as up here, okay? So what are we going to put on top? Fifty-five point eighty-five grams of iron. It's the same. It's the same thing, guys. Like that, okay? Making up rules. Don't be making up rules. That's when you start getting things wrong, okay? So twenty-five divided by twenty-six point nine eight times three divided by two times fifty-five point eight five. What do you guys get? Seventy-seven point six grams of iron. Nobody got anything except for one person out of all the people in here? Is that what you guys got? Yes. Wonderful. Okay, so which one is the amount that we're going to make? Top or bottom? Top. Top. Why is that? Is it the smallest? So what does that mean? Which one's the limiting reagent? Iron two oxide. Two oxide is the limiting reagent. I know there's a zillion questions on it, but we're going to kill it, okay?