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Let’s Get Cooking with Moles!

Br. Br. Br. Br. H. H. H. H. Let’s Get Cooking with Moles!. 2. HBr. H 2. +. Br 2. +. molecules. 4 x 10 -24 g. 320 x 10 -24 g. 2 (162 x 10 -24 g). Dozen molecules. 4.8 x 10 -23 g. 384 x 10 -23 g. 2(194 x 10 -23 g). Mass of one mole. 2 g. 160 g. 2(81 g).

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Let’s Get Cooking with Moles!

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  1. Br Br Br Br H H H H Let’s Get Cooking with Moles! 2 HBr H2 + Br2 + molecules 4 x 10-24 g 320 x 10-24 g 2 (162 x 10-24 g) Dozen molecules 4.8 x 10-23 g 384 x 10-23 g 2(194 x 10-23 g) Mass of one mole 2 g 160 g 2(81 g)

  2. The weight of a MOLE of one type of atom is equal to the atomic mass of that element in grams. Examples: Q: What is the weight of one mole of sulfur? A: 32.066 g Q: What is the weight of 0.5 mole of argon? A: 19.974 g Q: How many dozen are there in 6 nails? A: 0.5 dozen Q: How many moles are there in 6 g of carbon? A: 0.5 mol Q: How many moles are there in 1 g of H2? A: 0.5 mol

  3. grams Atoms, molecules, formula units ONLY FOR GASES!! Liters

  4. What is the gfm of water? • 2. How much does one mole of water weigh? • 3. How many moles are in 22.5 g of water? • 4. How much would 1.5 moles of water weigh? Formula: H2O 1 mole H2O = 2(H) + 1(O) = 2(1.008 g/mol) + 15.999 g/mol =18.015 g/mol 18.015 g #mol = 22.5 g H2O/(18.015 g/mol) = 1.25 mol H2O Wt. H2O = (1.5 mol)(18.015 g/mol) = 27.022 g H2O

  5. Cl2 Just like a dozen of something contains 12 of those somethings, one MOLE of something contains 6.022 x 1023 of those somethings. • 5. How many molecules of water are there in 1.5 moles? • 6. How many moles of NaCl are there in 2 x 1022 formula units of NaCl? • 7. How many atoms are in 2.0 moles of chlorine gas? #molecules = (1.5 mol)(6.022 x 1023 m’cules/mol) = 9 x 1023 m’cules Mol NaCl = (2 x 1022 form.u)/(6.022 x 1023 form.u/mol) = 0.033 mol NaCl Atoms Cl = (2.0 mol Cl2)(6.022 x 1023 m’cules/mol)(2 atoms/m’cule) = 2.4 x 1024 Cl atoms

  6. Mole Town can also be used to convert between moles and volume of a gas at standard temperature and pressure (STP). (STP = 273 K (0C) and 1 atm pressure) • 8. What is the volume of 2.0 moles of hydrogen gas at STP? • 9. How many moles are there in 50 L of helium gas at STP? Volume = (2.0 mol H2)(22.4 L/mol) = 44.8 L H2 Mol He = (50 L)/(22.4 L/mol) = 2.23 mol He

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