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Do NOW

Do NOW. Answer in Do Now section: If the formula for making a S’more is: 2 G + Mm + 3Cp  G 2 MmCp 3 1. How many S’mores can be made from 3 marshmallows? 2. How many S’mores can be made from 8 graham crackers? 3. How many S’mores can be made from 6 chocolate pieces?. 3. 4.

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Do NOW

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  1. G: Graham Cracker Mm: Marshmallow Cp: Chocolate Piece Do NOW Answer in Do Now section: If the formula for making a S’more is: 2 G + Mm + 3Cp  G2MmCp3 1. How many S’mores can be made from 3 marshmallows? 2. How many S’mores can be made from 8 graham crackers? 3. How many S’mores can be made from 6 chocolate pieces? 3 4 2

  2. #7.8 Aim: What can coefficients tell us? Agenda QOD (5) Lesson: mole ratios (15) Activity: practice (15) Closing (5) HW #9 QOD: How do chemists figure out how many moles of reactants they need to make things? Mole ratios

  3. #7.8 Aim: What can coefficients tell us? Agenda QOD (5) Lesson: mole ratios (15) Activity: practice (15) Closing (5) HW #9 Mole ratios Coefficients tell us the ratio of molecules (or moles of molecules) in a reaction. H H H H H H O  O + O H O H 2H2 + O2 2H2O They do NOT tell us the mass ratio.

  4. Mole Ratios Given the following equation: 2 moles of H2 are needed for every 2 moles of H2O, so the mole ratio is: 2H2 or 2H2O 2 H2O 2 H2 2H2 + O2 2H2O How many moles of O2 are needed to form 2 moles of H2O?

  5. #7.8 Aim: What can coefficients tell us? Agenda QOD (5) Lesson: mole ratios (15) Activity: practice (15) Closing (5) HW #9 How to use Mole Ratios: Example: How many moles of H2O are produced from the reaction of oxygen gas (O2) with 4 moles of H2? 2H2 + O2 2H2O Answer: 4 moles H2 x 2 moles H2O = 4 moles H2O 2 moles H2 Conversion factor!

  6. #7.8 Aim: What can coefficients tell us? Agenda QOD (5) Lesson: mole ratios (15) Activity: practice (15) Closing (5) HW #9 4Al + 3O2 2Al2O3 How many moles of Aluminum Oxide (Al2O3) are produced by the reaction of 8 moles of Aluminum with oxygen? 8 moles Al x 2 moles Al2O3= 16 = 4 moles Al2O3 4 moles Al 4 How many moles of Aluminum are necessary to react with 4 moles of Oxygen (O2)? 3 moles O2 x 4 moles Aluminum = 12 = 4 moles Al 3 moles O2 3

  7. #7.8 Aim: What can coefficients tell us? Agenda QOD (5) Lesson: mole ratios (15) Activity: practice (15) Closing (5) HW #9 Activity:practice Complete #1-5 Mole-Mole Problems

  8. #7.8 Aim: What can coefficients tell us? Agenda QOD (5) Lesson: mole ratios (15) Activity: practice (15) Closing (5) HW #9 Tricky mole ratio problems Use mole ratios as conversion factors! How many moles of water will be produced from the combustion of 3.0 mol of C2H6according to the following equation? 2C2H6 + 7O2 4CO2 + 6H2O

  9. #7.8 Aim: What can coefficients tell us? Agenda QOD (5) Lesson: mole ratios (15) Activity: practice (15) Closing (5) HW #9 Closing: How many moles of oxygen would you need to make 16 moles of water? 2H2 + O2 2H2O

  10. Do Now Given the following equation: • How many moles of P2O5 will be produced from 2 moles of P? 2. How many moles of O2 are required to produce 4 moles of P2O5? 3. How many moles of P are required to react with 10 moles of O2? 4P + 5O2 2P2O5 2 moles P x 2 moles P2O5 = 4 = 1 mole P2O5 4 moles P 4 4 moles P2O5 x 5 moles O2 = 20 = 10 moles O2 2 moles P2O5 2 10 moles O2 x 4 moles P = 40 = 8 moles P 5 moles O2 5

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