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Problem 83 Hard Difficulty

Use the periodic table inside the front cover of this text to determine the atomic mass (per mole) or molar mass of each of the substances in column $1,$ and find that mass in column 2 .
$$
\begin{array}{ll}{\text { Column } \mathbf{1}} & {\text { Column } 2} \\ {\text { (1) molybdenum }} & {\text { (a) } 33.99 \mathrm{g}} \\ {\text { (2) lanthanum }} & {\text { (b) } 79.9 \mathrm{g}} \\ {\text { (3) carbon tetrabromide }} & {\text { (c) } 95.94 \mathrm{g}} \\ {\text { (4) mercury(II) oxide }} & {\text { (d) } 125.84 \mathrm{g}}\end{array}
$$
$$
\begin{array}{l}{\text { (5) titanium(IV) oxide }} & {\text { (e) } 138.9 \mathrm{g}} \\ {\text { (6) manganese(II) chloride }} & {\text { (f) } 143.1 \mathrm{g}} \\ {\text { (7) phosphine, } \mathrm{PH}_{3}} & {\text { (g) } 156.7 \mathrm{g}} \\ {\text { (8) } \operatorname{tin}(\mathrm{II}) \text { fluoride }} & {\text { (h) } 216.6 \mathrm{g}}\end{array}
$$
$$
\begin{array}{ll}{\text { (9) lead(II) sulfide }} & {\text { (i) } 239.3 \mathrm{g}} \\ {(10) \text { copper }(\mathrm{I}) \text { oxide }} & {\text { (j) } 331.6 \mathrm{g}}\end{array}
$$

Answer

1

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Video Transcript

So here we have 10 chemical names and we are too determined their molecular weights or Muslim assets. So here I have this handy dandy, um, per table, help us out. So the 1st 1 is writing number one Esma Libyan, MMA, Libya or M o for the simple. So it's like here a Libyan is just, you know, a metal element and the free look for M o. Here in the periodic table, we will find the molecular formula formal idiom, some emos right here. So we know that it's molecular formula is 95.94 grams per mole. Huh? Grimm's Permal. All right, The next one is tonight. Man off. Sorry. Lengthy. Um, so lengthy. Um, has a chemical symbol of l. A. So now let's search for the metal that we should not man tonight, So we know a lengthy. Um, so we know of the length annoyed those going tonight. Siri's right here. So then you can easily know that it's in this row, which represents the one right here that we can find plenty. Um, what has a molecular weight of 1 38.9 grams per mole. Okay, Same units. Now the third run anymore is a compound still element and its carbon touch bro might. So this is see carbon touch of florid. So because this is represented here, a molecularly of Malek Clear a molecular. Sorry, bond. The chemical symbol is right in the name. So one carbon and then a tetra bromide. The texture means four. So we have four Brookline's for the one crepin. So now, to find him, like a little weight off this compound, we need to some the chemical, the chemical weight of carbon plus for burr might. So carbon is 12 and bromide is basically 80. So if we just went about our calculator do eight times four put 12 me get a big number. Expect 331 0.62 six in the same units that we just did four times 80 plus off put. And then, if you use all the units on aural, the decimals, all the six figs, we get this more accurate, you know, number. So next we have, um, Ionic Mont. We have mercury to oxide. So mercury mean it was h g. It's just right. No mercury to walk side. We know that Um, and Aqsa has a you know are charged two to minus number three because it's McGary to oxidant. That's already I told him. It told us that it charges two plus the markers right here. So we have. We have to oxygen's and to So we have oxygen has a two plus charge, and mercury are so her heat mercury has a two plus charge, and oxygen has a to minus church. So because they are the same, you know, churches. Oh, their chemical formula is just a geo, so you cancel each other out. So then Mercury's 200 its molecular weight and our kids decision is 16. So she's changing 16 0.6 for them like they're weights. Gams promote. Okay, Group's next we have. Next we have patane iam four oxide. So titanium is right over here and oxygen is right of your oxygen as we seen before has a to minus charge. And because it's titanium four oxide, we know the titanium has a four plus charge and because it's four titanium afford to its four plus for two minus. He then me to oxygen's to neutralize a titanium Adam. So we just get a T I. 02 strong titanium is basically 48 48 plus 60 times to just 32. So it's likelier molecular weight. We multiply that out Using these, this number of Adams is just 79.86 taken in tow, taking into effect all the dust Muslim sick fix. Great. So you can work this with me with your calculator. You have to practice. So the next thing we have is mag ng man Guineas to cord. So Corinne's halogen when my in charge in my agonies, as the name insights has to close church, Maggie needs to Corrine and Mangin eases right over here. So for agonies would require to chlorides to. Usually it's two plus church. So your office case of two cards, one man Guineas. So making these is 55 or over here. Chlorine is 35.5, so 35.5 times two plus 55 will give us, um, Electoral wheeler weight off 1 25 Put 84 It's a five 0.84 grams per mole, a posture feet. It's really have this boss fee. So they told him. Told us that false views Ph three is smocked so common two very to memorize could be in Just look at the name. So ph three, so prosperous has a molecular re of 31 hydrogen is basically one. So then we have three ones. Three plus 31 34. But if we, you know, actually want with all the sick thinks you will get a 33.99 which is so basically 34 3 round and see this, uh, So this who I'm doing it, what is require some earth taking mental math, but yeah, next when we have here is Tim to fluoride. So we know that Tim has a charge of two. Plus just by the name Tin to Florida. It's the metal. Let us associate with that too. And, you know, Floyd's halogen minus one and 10 Be careful is s n So for every you know, 10 anthem we require to Florida to new joys that at all church. So then to flow rides 19 plus 1938 game formal plus a 10 which is well, quite big. One 18 118. Then if we and that all up, we would get 1 56 point itself. It Graham's proposal get have noticed capital and dictates smaller mass. So now the next one we have is lead two sulfide to be careful. Sulphide indicates it's just sulphide. Not so fate. The poll Atomic, whose have one you know, sulphide Adam No Oxygen's so lead to Saul Fight sulfide over here has a to minus charge and lead. As the name says Lead two Sulfide has a two plus church. So for every lead atom, there's one software Adam, because you have, like the same absolute value of church. So what is their molecular earlier weight of this compound? So we have 207 plus 32. That should give us 239 0.26 grams per mole. Ingram's Pramono are apostrophe now. The last one pretend that's a 10 is copper one oxide copper, one onside. So, copper one tells us that the copper has a one plus charge and oxygen, you know, is a to minus chart. So we to Harper Adams to bond with that one oxygen That would see you too. Oh, here we have two metal Adams eso copper. See you is 64 approximately in 64 attempts to use, like 1 38 1 28 plus copper, two oxide copper. One are clear plus 16. So, uh, equal sums up to being 1 43.9 as we if we were to include off the Sig Figs Smalls. And there we have it. 1 43.9 molar mass of copper too, or copper one oxide.

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