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Certain molecular compound M has solubility in acetone of 92.2at 5.Calculate the mass of M that's dissolved in 200. mL of a saturated solution ofM in acetone a...

Question

Certain molecular compound M has solubility in acetone of 92.2at 5.Calculate the mass of M that's dissolved in 200. mL of a saturated solution ofM in acetone at this temperature_Be sure your answer has the correct unit symbol and number of significant digitsDxo0.09

certain molecular compound M has solubility in acetone of 92.2 at 5. Calculate the mass of M that's dissolved in 200. mL of a saturated solution of M in acetone at this temperature_ Be sure your answer has the correct unit symbol and number of significant digits Dxo 0.0 9



Answers

A solution was made by dissolving $3.75 \mathrm{~g}$ of a nonvolatile solute in $108.7 \mathrm{~g}$ of acetone. The solution boiled at $56.58^{\circ} \mathrm{C}$. The boiling point of pure acetone is $55.95^{\circ} \mathrm{C},$ and $K_{\mathrm{b}}=$ $1.71^{\circ} \mathrm{C} / \mathrm{m} .$ Calculate the molecular weight of the solute.

Okay, this ends up being a conversion calculation will start with a 7.5 leaders and they want us to figure out the massive acetone in the 7.5 leaders of the mixture. So we know the relationship between leaders and mill leaders 1000 to 1. We can then cover it the milled leaders, two grams knowing the density which they gave us 20.9867 grams per mil leader. Then we can go from the grams of the entire solution, which we have right here. Two grams of just acetone using the percent mass. So there's eight point. It's 8.5% acetone. Then there's 8.5 grams ass atone for every 100 grams of the mixture. This is where we use the percent mass to finally get our grams. Ask the tone Then when we know the grams, ask the tone will comfort two kilograms and get 20.6 to 9 kilograms acid tone in 7.5. Leaders of the solution

So if this problem were given Moller soul ability values for three com boned and we'LL have to find the case Be velo for those compounds. So first we need to know the relation between case B and the mother cell ability off a component. So if a compound every form of love am x em then ah, the KSB off that compound willbe equal to aim is to depart AM Where is the mother cell ability? And I am so coming from here Times in is to the party end are again answer coming from here And this is the Mueller celebrity on the lamp on. And if we just rearrange it will have him to the bar m into the bar in is to the bar in plus and some. Now, if you just no, their formal of the component. We know the virus off him and and, as you know, here, the smaller celebrate of the compound we can easily know the value ofthe case before his compound here by applying this formula. So for the first one we have on the compound formulas, M X, that means, um, the value of boot him, and in here are one. So we'LL have, um the expressionist case being well because toe is square now the value ofthe Siri's three point two seven times Still woman is eleven And if we just put the square we'Ll find a case people for this which is one point all seven times go minus twenty one Now for the second one, we have the com bone bb if two. That means, um the aim is developed in here is one and the well off in his too. So our case b will be called to I came to the bar and means want to the poor one And so do the birds too. That means two square and extreme or implicit means is truly worth three. And here we have the Mueller celebrity Hello are the heirs villas five point six three times still over minus three So you just like the value here for s we'LL have the case people whom for this compound has seven point one for time Sturdier minus seven And then for the last one We have mgf too for which you have the value ofthe him again as one and well off in as two and similarly will have the same expression. Kids will be too Square s cube. And if we just so for this one, we have and is Velu off or the molars celebrity of hello as two point six five times ten to the minus For him it was put that value for this is we'll have the case People whom for m j F two as seven point four four times tend to the bar minus eleven. So this is the case the vellum for M j f too.

Question. Number 56 is a morality question where given an amount of solute in amount of solvent, you're asked to solve for the morality. So let's define morality. First, morality is equal to the moles of the solute per kilograms of the solvent. This is important. I know I had solution down here. But this is important to recognize that formal ality in the denominator. It is the solvent alone and not the solution. So morality can then be calculated by first determining the moles of the salute. We don't know the most of the salute, but we do know that. But we do know the grams of the salute. We can convert the grams of the salute into moles of the salute by dividing the Mueller mass of the salute ammonium iodide into its mass. Well, then divide by the kilograms of the solvent. We don't know kilograms, but we do know volume. We can convert volume in mill leaders 2 g using the density that was provided for water. Then, when we know the grams of the water, we can convert the grams and 2 kg by dividing by 1000. This gives us a morality of 0.288 Ammonium iodide

Of on. This is Ricky today, working on problem 97. We're gonna be calculating them only solid ability of let hydroxide in a 0.138 Moeller solution of C H three n h two. All right, so let's write out our expression for a buffer ch three and H two plus H +20 It's three an inch plus oh h minus Right out or K B expression. Oh, fair ch three an h two. Oh were given that K B is equal to 4.4 times 10 to the negative four and we have a concentration of stage three Image, too. Just point 138 Moeller minus x x x x squared over 0.138 Mueller minus X who's 4.4 times since then? 1/4 use the quadratic to solve when we get X is equal to hydroxide concentration, which is equal to 7.6 times 10 to the negative three moley. So let's keep this in our pocket. All right, so now we're gonna be solving for the mullahs. Souljah bility let hydroxide. So that's right out that solution equation. He b plus two plus two voyage minus Ke SP equals 2.8, understand 16 rks p expression is pp plus two times oh h minus squared and rearrange for light I and concentration. We get Casspi. No fair oh H minus squared is equal to 2.8 times 10 to the negative 16 hope for 7.6 times since the negative third squared and you might be tempted two multiplied by two because this is a common thing that we do when solving these types of equations, but were given a concentration, so there's no need to take into account molar ratios. And what we get for the lead ion concentration is 4.8 come since winning 12 which is equal to the Moler salty ability of blood hydroxide. So if this video is helpful seeing them


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