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Wcanu M(ldcuiO uturle uueet #ntcngwalet} of the nakncsium Ahdm rerova] Ir aprtuentnalz70.0 grants of polassium hydroxice?tompud Wht lonned when 0B(} moles ofburium ...

Question

Wcanu M(ldcuiO uturle uueet #ntcngwalet} of the nakncsium Ahdm rerova] Ir aprtuentnalz70.0 grants of polassium hydroxice?tompud Wht lonned when 0B(} moles ofburium Gcunbine with GOmnulcs ol chlorue the erpirical forntula for this compound?compound contains WVkal 3.24 grams of sodium; the empitica fomula 2.26 grams of sulfur, und 4.51 Orams of oxygen for (his compound?Calculate the percent water in iron(II) sulfate heptahydrate.Lam4a Metd

Wcanu M (ldcuiO uturle uueet #ntcng walet} of the nakncsium Ahdm rerova] Ir aprtuent nalz 70.0 grants of polassium hydroxice? tompud Wht lonned when 0B(} moles ofburium Gcunbine with GOmnulcs ol chlorue the erpirical forntula for this compound? compound contains WVkal 3.24 grams of sodium; the empitica fomula 2.26 grams of sulfur, und 4.51 Orams of oxygen for (his compound? Calculate the percent water in iron(II) sulfate heptahydrate. Lam4a Metd



Answers

A compound has the following percentages by mass: barium, 58.84\%; sulfur, 13.74\%; oxygen, 27.43\%. Determine the empirical formula of the compound.

When you're converting between quantities of given chemical substances, it's useful to draw out a roadmap or a plan to know how to get from the given information to the required quantity. So if, for example, you're given a quantity in moles 8.42 moles of a compound called chromium three sulfate Decca hydrate, and you want to convert that to however many grams or mass. The way to do that is by using the Moeller Mass. Remember, the molar mass is found by adding up the atomic masses of each element from the periodic table to given overall mass the compound. So the first step is to figure out what the chemical formula is for the substance. So chromium three greens. It's an ion with the CR with the three plus Sophie is s 04 to minus the Poly Atomic. I am Decca Hydrate means that it will have attached to it. 10 water molecules. The Decca is for 10 and hydrate means water. So the formula for this neutral compound is C R. Two s o for three 0.10 h 20 And we can find the molar mass of that using the periodic table two times the atomic mass of chromium, which is 51 0.996 plus sulfur. And there are three suffers, so three times 32.6 plus the oxygen's, of which there are 12 because there are four in the sulfate and there are three sulphate ions, 12 times 15 0.999 Remember, these numbers are the atomic weight on the periodic table plus hydrogen, and there are 10 times two or 20 times 1.8 And finally we have an additional 10 oxygen's from the water molecule, or one mole of this compound has a total mass of 572 0.3 grams. So if I have eight point for two moles change two grams, I multiply by 572.3, so 8.42 times 572.3 is equal to 4.82 times 10 to the third grams. You may be given a quantity and molecules rather than grant your moles, so we have 1.83 times 10 to the 24 molecules of die chlorine helped oxide, and we can change that two grams, but in order to do that, we have to change it to moles first. The relationship between molecules and mold is using off a god rose. Number one mole of any substance has 6.2 times 10 to the 23rd molecules. Once you've gone from molecules to moles, we can then use our molar Mass to find Gramps. So it's similar to what we did before. But we have one more step. So we need to know the formula of die Chlorine helped oxide di means to So it's C L two helped me in seven. So it's 07 and one mole. We'll have a mass of two times the atomic weight of chlorine 35.45 plus seven times the atomic weight of oxygen for 15.999 So one mole of die chlorine help dockside has a mass of 182.89 grams per mole. So if I start out with 1.83 times 10 to the 24 molecules, every one mole has 6.2 times 10 to the 23rd molecules and everyone mall also has a mass of 182 0.89 grams, so I multiply 1.83 times 10 to the 24th times 1 82.89 Your divide by 6.2 times 10 to the 23rd for a math of 556 grams. Another example you might see asks it to break down even further. If you have a given mass of a quantity 6.2 grams of a compound called lithium Sophie, we can find out how many moles that IHS using Mueller Mass. And once we have that information, we can find out how Maney Formula Units Formula Unit is just like a molecule. It's the base unit, the smallest particle of an Ionic compound. And so, again, in every one mole, there are 6.2 times 10 to the 23rd formula units we use of a God rose number. So the first step is to figure out what lithium self it is with the, um I on his ally plus and self, it is s o for two minus. So the compound is ally to s 04 and it's Moeller math, using the periodic table and adding up to lithium. One sulfur and four oxygen's equals 109 29 4 grams. We're starting out with 6.2 grams. Uh, ally to eso, for I can change that two moles by dividing by the molar Mass. Because I'm want moles. It's a 6.2 divided by 100 and 9.94 gives this 0.56 moles to find that and formula units multiply by Abu God. Rose number or 3.4 times 10 the 22nd formula units using the idea of what the formula unit is made up, up. We can also describe how Maney ions are present. So if I have 3.4 times 10 to the 22nd formula units in every formula unit, there are two lithium ions, or there would be a total of 6.8 times 10 to the 22nd with them I on. We can also describe how maney sulfate ions there would be because in looking at the formula in every formula unit, there's one sulfite I on for every formula unit or 3.4 times 10 to the 22 sulfate ion because also described how Maney Adams are present in every form really unit by looking at the ratio in the formula. In every formula unit, there is one sulfur atom based on the formula. So if I have 3.4 times 10 to the 22 formula, units have 3.4 times 10 to the 22 sulphur atoms. If instead I ask about oxygen atoms. When we look at the Formula Unit, we see that there are four oxygen atoms in every formula unit. So if I have 3.4 times 10 to the 22nd formula units, I should have four times as many oxygen atoms or 1.4 times 10 to the 23rd.

All right. So here we have eight on chemical compounds, and we're going to find the mass percent off the first element present. Let's recall the mass percent formula. The way we calculated it is we take the mass of the element, whatever element in question, massive the element and divided by the total mass but the total mass of one mole of substance, like one wall of the chemical. All right, so first, we have, um, sodium a site, and we're gonna start off by listing each moment in this chemical compound. Now we're going toe. Calculate the mass of each compound. So let's remember little formula for mass. We can go to it mass, both heating malls, multiplying it. But Moeller muss. All right, so we know we have one mole of substance, one mole of sodium a side. So if you have one more sodium a site, that means we also have one more off sodium. And that means we then have three moles of nitrogen, right? And then we'll multiply by the molar mats of each substance. Sodium small amounts is all right. 22.98 months of in Seoul, right, 23 actions. More mass is 14 dams Permal. And once we told this up, we get 65 which is now our mass total. So no, the mouse percent sodium. The first element somebody gonna be this 23. That's the mass of sodium. Over the mass. Total 65. Well, these were both Ingram's. You take your jocular and polling food more off the pigeons, we get a mass percent off 35 point 36 All right. Okay, let's move on. Next. We have copper soffits. We're gonna do the exact same, um, methods list up the elements, and now calculate the mass of each element so you can find a whole mouse. All right, so remember, always one more of the chemical. More copper to selfie. So one more of copper. Two sulphate is one off copper. One more sulfur and formals of oxygen. And we'll multiply these moles by the more mouse of the substance of the element. I'm here. We've now committed mass. Okay? No, on three. Some. All of these masses up, we get 159 0.6, just the total mass. Then we'll take the massive copper drawing looking for the mass percent off the first element. Math percent of copper is the mass of Klepper over the tomas 0.6. Okay, Not equals 39.81 remind 0.81 person's. Okay, well, that's really but faster. Here we have gold. Three chlorate. So yep. Gonna list out each compound. Men calculate their mass. One more off gold and one more awful to chloride. Courtnall. Masts 1 96.9 And your three moles off court. Can we find the total mass, which is 300 country in the months percent of gold is just this mouth over the Thomas. It gives us a mass percent 64 0.9 four. You hit next. We have silver nitrate do the exact same thing. One more silver nitrate. It's Gwen Moore Silver. So there's more mass. It's 107 0.8. You have one more off nitrogen Khiry of three moles of oxygen. Okay. And that summed up is one 70 around him. Kate. Then the mass percent for silver shut mass of the element over mass total. Here's a 63.5%. Next, we have obedient, so feet. Heavens, he bidding before it's an alkali metal group one. Okay, so it's first list out each element. Okay, so here we have two moles of rubidium, not the usual one. And it's more masks, 85.5 grams from oops, 85.5 grams. Next we have one will. So, feet. So if you're wondering us, I am looking at the sub scripts here that tell us the number off each Adam to find moms. True. And the oxygen formals. More massive. Look, 15.9994 grams per mole. And the total sum is to 67. All right, so most percent of rubidium is two multiplied by 85 to take the Thomas, then divided by to 67 to give us 64 point Oh, 2% Next up, sodium. Correct. So yet again, it will was talked each element. Then find number of moles of the element multiplied by the molar Mass of the element Do the same thing for each. Adam. Also, this is also how we would calculate, um, moment mass you. But you know, Yeah, we were actually moments in the exact same way, but we wouldn't be using Matt moles multiplied by more mouth. That formula, Thank you. Ate it. Is that more mass is the molar mass of each element and the some of that. So it isn't a mold. Multiple of another mass calculation, but a number at us. So then math present. The podium is trying to put nine over the total mass. It gives us 21.6%. Hey, next up, we have certain are right. Next region Try died. Well, we just list out the mess. Every element you forget I died is a college in So group 17 True. This then sums up 23 94 grams Okay, mass percent of nitrogen then would be 3.55%. So quite small. Just this very large item I died is taking up all of that wheat. Oops. Look. Must want this caesium bromide Caesium. It's right under rubidium. See your winery? Que so we have one mole of each to these elements. 1 32.9 grams promote for caesium and Romy. 79 0.9 grapes for more. Here the total mass 2 12 mass percent proceed iam its massive element over mass total because a 62.45%

Okay, So for this question, they want us to find the present composition of all of the elements in each of the compounds. So, uh, let's do any to eso for first. So the molecular weight of any to S 04 is 1 42 0.4 grams pramono. Now let's find the present composition of sodium for so we have once element one more sodium is equal to 23 grams and one mo of so far is 32 grams and one mo of oxygen is 16 grams. Right? So the present composition of sodium is 23 grams times that by 26 we have to Fujian's divided by the total mass of the compound, which is 1 42.4 This gives us 23 times two is 46 divided by 1 42.4 and we get 32.3 6% now for so for we have 32 grams, divided by 1 42.4 He gets 22.53% and for oxygen we have 16 grams. There's four. Oxygen's divided by 1 42.4 and we get 45 points by 8%. Go now for the next one we have into, 04 The molecular weight of and 204 is 92 grams from Oh, nitrogen is 14 grams. Formal oxygen is 16 grams. Well, right, so we have Ah, nitrogen is 14 grams times that by two. Since we have two night trillions divided by 92 grams and we get 30 points for 3% imagine now what we can do. Since there's only two elements present, we could do 100 minus 30.43 and get an answer, but I'll just solve it So we have Oxygen is equal to 16 grams times about four divided by 92 way get 69.57 percent for this compound. The molecular weight of S. R. Parentheses and all three parentheses to is to 11.63 grams Promote. So when Mo of Shaun T. M is 87.62 grams, nitrogen is 14 grams, oxygen is 16 grams. All right, so we have for Shanks and we have 87.62 grams, divided by 2 11.63 and we get 41.4% Now for next June. We have 14 grams times about two because outside the parentheses is or two. That means we multiply everything inside the parentheses by two divided by 2 11.63 grams and we kids. But their team 0.23% Nuffer oxygen. We have 16 grams that times it by two times three here that six divided by 2 11.63 and we get 45.37% now for a l choose as three D. Moger weight is 150 point 158 eso we have, ah, one more Aluminum is 27 grams. One more of so far is 32 grams. We have aluminum is equal to 27 grams times it by two causes fuel woman president by 1 15.158 and we get 35 0.96%. And for so for we get 32 grams times by three, divided by 1 50.158 and we get 63.93%

So for this problem we're talking about Molla mass in basically it is the summation of the atomic masses Uh, elements in a competent. So it was gonna find the atomic weeks of each individual element and then add them together to find the moments of all of elements. First, we're trying to find the molar mass for iron gluconate, which is F e parentheses. C six h 11 07 So, in order, find this. We need to find out what the atomic masses are of each individual element. So go look on my periodic table and every periodic table differs with the masses. But I'm just kind of going off of the period of stable that I have. So on this periodic table we have the atomic massive iron is 55.8 45 grams per mole. Or am you which is atomic Machin? It's for carbon. The Moeller The atomic weight is 12.107 grams per mole for hydrogen, it is 1.7 84 and for oxygen is 15.999 And all of these air grams per mole exper So we're going to multiply each of the individual atomic masses by how many? How many how many moles of that element we have, and then we're gonna add them together. So for iron, we only have one, so we don't do it. Today we have 12 carbons because there's parentheses and it's too. So you multiply that to buy, you know, the sub scripts. So we have 12 carbons. We have 22 Hodgins in 14 Oxygen's. So we're add this up, we're gonna do 55.8 45 and then gonna add that 12 times 12.107 plus 22 times 1.784 plus 14 Tom's 15.99 Add that and that I give you an overall molar mass of 446.13 grams per mole. That's the answer per apartment number. Heart Be were finding the molar mass fighting among the mass of buttes of Theo buttes and Theo. And that is ch three ch two c h two c h two s each. And we know the mom as the atomic weights for carbon and hydrogen. But we have a new element, which is so far. So first Atomic Miss is fort is 32 0.66 grams per mole. Use that and we're doing the same thing We have 1234 carbon. So what do four times 12.107 We have how many hydrogen we have? 34567 Eat nonsense. So plus 10 times 1.0 784 plus 32.66 And then we're gonna add that give you an overall movements of 90.19 grams purple Part C. We are as to find the moments of Quinn in which is, say, 20 h 24 in 202 Same elements. We have one knew other men, which is much region. The atomic mass of nitrogen is 14.674 and same thing is before we have 20. Carbons were doing 20 times 12.107 plus 24 times 1.784 plus to Tom's 14.674 plus two tons 15.999 But add that all up together in the couplers and Then I give you over a move s of 324.41 grands. That is yes, this is diversity.


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