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Problem 109

A 0.652 -g sample of a pure strontium halide reacts with excess sulfuric acid. The solid strontium sulfate formed is separated, dried, and found to weigh 0.755 $\mathrm{g}$ . What is the formula of

the original halide?

Answer

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## Discussion

## Video Transcript

So we are. So, points, it's five to grandma Strong. You're strong. You're here tonight. Australia meets a good to matter, and he'll idea or seven, Um, Element. So ah, therefore, performer that that we can deduce this That is as our ex, too. Because now I have two plus And for off the goods seven m and day when a foreman and I think they must have one minus ah, for the charge. So that's why ah, from here we can conclude that formula. We've asked Alex to, but we just don't know which. Um hey, guy that we're looking at. Okay, so when this hate high school into we have excess, um, so for acid he would form our story. And so how strong yourself eat. And then we measure a syrup on 755 grand. So what would be the formula for stronger healer? So what would be the identity makes? Okay, so you know, the defining that, uh, find this, um ah. The identity of aches and formula for S R. S R X too. So we have to first again well, the chemical equation. So where has out is to we have with our self arrested, and then they will be going to form our H eggs. She had to off them Does Asyl s 04 That's our S 04 And this is solid. And I believe this also solid. Okay, so, um, we are again. We're going to balance the chemical reaction. But I already did that. We just laid out to Infinity H X, and then we have everything. Balance. Okay, so the next obvious, we're going to, um, come over all the information that we have, the 1st 1 will be the the mass of Ah, strong yourself. It. Okay. So, again, we're not going to We're going to use the number most not going to use the massive. We're going to convert that to number most. So we have seven. Cyril 70.755 Graham off our strong Liam ourself 80 white by the molar mass. So we have one strong Liam. Ah, and then we have one sell for And then we have four, um, prosecute and the ah, we should be able to find that the lumber off movies he goes to 4.1. Want time. Tend to live free in bowls. All right, So we have the number of months off our, um, strongly in self eight. Okay, so, uh, at the same time, we know that. Ah, our ah song Australia. McHale I Ruby. He goes to see her points. It's five to Graham. And from our, um, move away show, we can see that the motivation between our strong Liam. Ah, hey, Light. And also our strong yourself fate. It's once you want. So therefore, strong him. Hell, I must be. Have the same number move in order to keep 4111 time. Tend to your power Led the three. Most are strong yourself it So why here? We know that the lumber muscle strong em. Hey, life. And also the mess. Okay, so, um number most. He goes to mass over more than mass limbo. MODY hosting mass over more Thomas. Okay, so the Momo's you go to mass. Do you live by Move the mess and we already have a mess in the limos. We should be able to find a more more the mass. And then we confound the identity or face and also the formula. Or s I x two. Okay, So, first of all, we go back to copy and paste all the information we have 4.11 Ah times 10 todo let if three most and and, um, a mass. We have a serial points. It's five to Graham on this trippy mould. All right, So how about the moon? A mass? So the movement masses that we know that we have one strong young plus two Ah, hey, light. And if you go back to our people to table the strong Liam didn't want the periodic table I have will be 87 0.62 gram promote. Ah, for 87 points. It's two grand per mil. So we have Graham promote. All right, So what? From From this point, which is we move for the unit. It would be easy at you saw four X. Okay, so we have 87.62 plus we just No, no, the more the mass off the hate ice. That's why we want to find out. And then we have to limbo most. We left. Okay, so we're going to solve for this equation. Okay, so ah, let's do some mathematics. So we have a soup. 152 We're going to cross multiply. So we have 4.11 Time 10 Thio Ah, there. Three times this seven point. Ah, 62 And then we shall soon appoint Flea is zero plus our ah, a 0.44 times 10 to the lead. If we at this last week X because there's 87.62 times are formed when one times left me and also to x. Okay, so, uh, we're going to again to sell for sakes. So we are going to sell for this. Ah, equations. Simple as rubber the wider by a 0.4 times and And we should be able to find a spot for around 34 takes. He's will you around for the furry 4.76 4.76 grand Permal All right, so we're going to go out to our periodic table, and then we look for the one that had to say We're looking at seven and look for when they have the same decor. Um, all of the mass. And we find that Ah, yes, Cory. So therefore we go back here, we can conclude that X will be Cory and our, um Ah, for me that would be asked how? See Out too

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