Reaction of gaseous fluorine with compound X yields a sin- gle product Y, whose mass percent composition is 61.7% F and 38.3% Cl. (b) Draw an electron-dot structure for Y, and predict the geometry around the central atom.

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Hello. In this video we are told why is the product of the reaction of gaseous bromine and gasses. Flooring, Why is composed of 45.687% roaming and 54.313% flooring. We're asked to find the lewiS structure for Y. And also the geometry of its central atom. In order to determine the LewiS structure for why. We first have to come up with its chemical formula. So we though the number of Boeing and flooring Adams. We can determine the chemical formula for why by making use of the composition of why. So we will begin by assuming can we have 100 g of why? Given that Y is 45.687% grooming. That means we have 45.687 g of roaming for every 100 g of Y. Programs of Y cancels. We have 45.687 g of grooming. And given that Y is 54.313% flooring, it means we have 54.313g of flooring for every 100 g of Y. Programs of white cancels. We have 54.313g of flooring to determine the chemical formula for why. Then we have to find a mole ratio. So we cannot determine the chemical formula based on a mass ratio. So we'll need to convert our masses from two moles Using the molar mass. So we have 45.687 grams of grooming Referring to the periodic table. Find one more Browning has a massive 79.904g of roaming Setting up a mole mass. Programs cancels you have 0.5718 moles of roaming. We have 54.313g of flooring, Referring to the periodic table. one mole of flooring has a mass of 18.998 g. Our massive flooring cancels. We're left with 2.8589 holes. The flooring Now to determine the chemical formula, we divide the larger number of moles by the smaller number of moles have 2.8589 moles of flooring Divided by 0.5718 moles of grooming. This works out to five moles of flooring for every one mole a booming. So the chemical formula then is the RF five. So this is our chemical formula for why? Now that we know the chemical formula for why we can draw it's lewis dot structure. To draw the lewis dot structure, we have to determine the central element. The central element is recall usually the least electro negative element and chlorine is the most electro negative element. So that means that in our skillet structure romaine is going to be The central element and it's gonna be surrounded by five Warren's. If we look at the skeletal structure at this point, we see that the bombing is going to form bonds with five florins, which means then that we are going to have 10 electrons at a minimum around grooming one for each of the five bonds or two electrons for each of the five bonds. So romain will already have an expanded Dehlin's show. Romain is in period four. We call the elements in period three and beyond can have expanded valence shells, which means they can have more than an octet around them so they are an exception to the octet rule. To finish the lewis structure for our compound, Y we are going to find the number of valence electrons that are available to form bonds and we have Lauren and grooming. These are both in group seven A so they all have seven valence electrons. There's a total of six of them, five florins in one grooming. All six have seven valence electrons. So six times seven it's 42. So we have 42 electrons to account for. We will begin by filling our bonds. So those that are shared, so we have 2468, 10. So we've accounted for 10 of the 42 electrons we have 32 electrons left to account for. So now we are going to fulfill oct it's for our outer elements are florins. They each have two electrons around them currently with a single bond, so they each need six more To get to eight. And so are five florins. Each have six electrons now being added. So six times five is 30. So we've accounted for another 30 electrons. So that means we have two left over to account for those remaining two, then go on. The central element to um ensure that we have accounted for all 42 electrons. So now if we look we see that browning has 2468, 10 12 electrons around it. So it does indeed have an expanded valence show which is to be expected, giving that it is in period four. Now that we have the lewis structure, we're going to determine then the geometry for booming in order to do that, then we determine the number of groups around our central element. So we have groups. So we have six groups of electrons, We have five bonding pairs and we have one lone pair. When we have six groups of electrons around the central element and five of those groups are bonding pairs and one is lone pair. The geometry is referred to as square pyramidal. So in this problem we were given the percent composition of our compound, why we had to um make use of that composition to determine its chemical formula. Once we know the chemical formula, we can then draw the lewis dot structure. So the lewis dot structure for our compound, y then has five florins around it. And a single lone pair, we then from this can determine the geometry um for our central element grooming, we determine the number of electron groups that are around the central element. We have six groups of electrons. Five of those groups are bonding pairs, and we have one lone pair. And so that leads us then to the geometry of why being square pyramidal. So thanks for watching the video. Hope it was helpful.

Reaction of gaseous fluorine with compound X yields a sin- gle product Y, whose mass percent composition is 61.7% F and 38.3% Cl. (b) Draw an electron-dot structure for Y, and predict the geometry around the central atom.

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Key Concepts

Mass Percent Composition

Electron-Dot Structure (Lewis Structure)

Molecular Geometry