Warm Up #1 If we were curious about finding the molar mass of a substance (say, NaCl), how can we find it? You have Iron (III) Oxide. Knowing the name.

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Warm Up #1 If we were curious about finding the molar mass of a substance (say, NaCl), how can we find it? You have Iron (III) Oxide. Knowing the name of this substance, how many Iron atoms do you have, what about oxygen atoms? What is the molar mass of this compound? 1 mole of a substance = _________ atoms? What is this number called again? Yeah, we’re bringing this back.

Chapter 10.1, 10.2 The Return of the Mole

Molar Mass and Moles Molar Mass (g) of compound = 1 mol Periodic Table (bottom #) 1 mol Fe = 55.85 g Fe 1 mol Fe2O3 = 2(55.85) + 3(16.00) = 159.70 g Fe2O3

Try These Find the masses (in grams) of 1 mole of…. Sulfur Trioxide Sodium Carbonate (CO3-2) Nitrogen gas

Chemistry Conversions Chart Grams Mass # of element Bottom # on periodic table Moles ALWAYS 1 mol when converting HEART of chemistry

Atoms and Moles 6.022x1023 atoms = 1 mole (Avogadro’s #) True for ALL elements/compounds/molecules 1 mol Fe = 6.022x1023 atoms Fe 1 mol Fe2O3 = 6.022x1023 formula units Fe2O3

Units You Will See 6.022x1023 _______ Examples: Just one single element (N) = atoms Covalent bonds (N2, H2O, C6H12O6) = molecules Ionic Bonds (NaCl) = formula units Ions (Ca+2, SO4-2) = ions

Chemistry Conversions Chart Grams Mass # of element Bottom # on periodic table Moles ALWAYS 1 mol when converting HEART of chemistry Atoms 6.022 x 1023 atoms Avogadro's number # NEVER changes

Quick Quiz #1 60.0 grams Na2CO3 = ____ mol Na2CO3? 9.0 mol Na2CO3 = _____ formula units Na2CO3? Why is Na2CO3 expressed in formula units? 60.0 grams Na2CO3 = ____ formula units Na2CO3?