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Copy this table and use a periodic table to complete the second column$$\begin{array}{ll}\text {Chemical formula} & \text {Molar mass (g/mol) } & {\text { Moles of what?}} \\ {\operatorname{Ne}(g)} & & {1 \text { mol Ne atoms }} \\ {\mathrm{Ca}(s)} & & {1 \text { mol Ca atoms }} \\ {\mathrm{CO}_{2}(g)} & & {1 \text { mol carbon dioxide molecules }} \\ {\mathrm{CaCO}_{3}(s)} & & {1 \text { mol calcium carbonate units }} \\ {\mathrm{CH}_{4} \mathrm{O}(l)} & & {1 \text { mol methanol molecules }} \\ {\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}(l)} & & {1 \text { mol ethanol molecules }} \\ {\mathrm{Fe}_{2} \mathrm{O}_{3}(s)} & & {1 \text { mol iron oxide units }}\end{array}$$

159.7 $\mathrm{g} / \mathrm{mol}$

Chemistry 101

Chapter 14

Measuring Toxins

Section 4

Molar Mass

Atoms, Molecules and Ions

Composition

University of Central Florida

Drexel University

University of Toronto

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All right. So here we're looking at, uh, quite a few, uh, chemical formulas and their molar masses. So let's take a look at one mole of each of the following compound so we'll do. Neon gas will do calcium solid, will you? Carbon dioxide? Yeah. Teoh calcium carbonate, which is a solid will do. Um, methanol, which is a liquid will do. Ethanol is a liquid, and we'll do iron oxide, which is the all right. So here's where we will take a look at the period table and start adding stuff together, right? So starting off with neon, what's the molar acid beyond? We just take a look at periodic table, take a look at that average mass number, and that's 20.180 grams per mole. Same sort of process for calcium, and we find that it's 40 point 078 grams per mole for carbon dioxide. We add up, um, the mother mass of one carbon atom, which is 12.11 plus two times oxygen, which is 15 point 999 and this gets us once. We add all those two up 15.999 times two plus 12.11 That is 44.9 grams per mole. Calcium carbonate. So we've got Kelson here. We've got carbon here and we've got oxygen. So we need three times 15 999 for oxygen plus 12.11 plus 40.7 08 So once you add those two up, we get 100 point zero a six grams per mole. No for methanol. So we've got, um, four hydrogen total one there, three there. So it's four times 1.8 France from old for hydrogen plus oxygen 15.999 plus one carpet 12.11 That's gonna equal, UH, 12.11 plus 15.999 plus four times the quantity of 1.8 That's going to get us 32.4 two grams per mole. Now for ethanol, that's two times 12.11 waas 15 points 999 Plus, uh, I believe five times hydrogen, which is 1.8 That's equal 45 0.6 grams per mole Now for iron oxides. We've got three times Austin 15.999 what? Two times iron, which is 55 point for five grand from all. And adding those two up, that is 143 point six eight eight grams per mole, and that's that.

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