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Catalyst – December 5-3, (2000+9)

Catalyst – December 5-3, (2000+9). What is the molar mass (g) of CO 2 ? Using your answer to #1, calculate the mass (g) of 4.0 moles of CO 2 . How many atoms are in 65 grams of CO 2 . Please pass Homework up to the front! Grab a calculator!. Today’s Agenda. Catalyst

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Catalyst – December 5-3, (2000+9)

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  1. Catalyst – December 5-3, (2000+9) • What is the molar mass (g) of CO2? • Using your answer to #1, calculate the mass (g) of 4.0 moles of CO2. • How many atoms are in 65 grams of CO2. Please pass Homework up to the front! Grab a calculator!

  2. Today’s Agenda • Catalyst • More Stoichi-stoichi-stoichiometry… • Practice ‘til the cows come home • Exit Question • (Honors: Science Fair)

  3. Today’s Objectives • SWBAT perform stoichiometry to convert between moles, number of particles, and molar mass. • SWBAT perform stoichiometry with chemical reactions.

  4. S’molar Ratio Smore Equation: How do you make a S’more? 2 GC + 1 M + 1 C 1 Smore GC = Graham Cracker M = Marshmallow C = Chocolate Piece

  5. What does this mean? 2 GC + 1 M + 2 C1 Smore • For every 2 graham crackers, how many s’mores do we produce? • If we had 6 pieces of chocolates, how many s’mores could we make? • If we had 6 marshmallows, how many s’mores could we make?

  6. It’s the same thing with reactions… Key Point #1: There are 3 steps to solving stoichiometric problems involving chemical reactions: • 1) Balance the equation • 2) Figure out what to what • 3) Convert using train tracks

  7. Three Types of Stoichiometric Problems Key Point #2: There are 3 types of stoichiometric problems: • 1) Mole to mole • 2) Mole to mass • 3) Mass to mass

  8. Stoich-i-ncredible: Mole to Mole! Balanced Equation: Remember! Coefficents = Moles __ Al + __ O2 __ Al2O3 If we have 9 moles of O2, how many moles of Al2O3 would form? First we have to balance the eq. FIRST STEP???

  9. Stoich-i-ncredible: Mole to Mole! Balanced Equation: Coefficents = Moles 4 Al + 3 O2 2 Al2O3 If we have 9 moles of O2, how many moles of Al2O3 would form? What to what? Mol O2  Mol Al2O3 SECOND STEP???

  10. Stoich-i-ncredible: Mole to Mole! Balanced Equation: Coefficents = Moles 4 Al + 3 O2 2 Al2O3 If we have 9 moles of O2, how many moles of Al2O3 would form? THIRD STEP??? Train Tracks!

  11. Stoich-i-ncredible: Mole to Mole! Balanced Equation: Coefficents = Moles 4 Al + 3 O2 2 Al2O3 If we have 9 moles of O2, how many moles of Al2O3 would form? 9 mol O2 mol Al2O3 mol O2 WHAT IS THE CONVERSION FACTOR???!?!?!?!?!?

  12. Stoich-i-ncredible: Mole to Mole! Balanced Equation: Coefficents = Moles 4 Al + 3 O2 2 Al2O3 If we have 9 moles of O2, how many moles of Al2O3 would form? 9 mol O2 2 mol Al2O3 3 mol O2

  13. Stoich-i-ncredible: Mole to Mole! Balanced Equation: Coefficents = Moles 4 Al + 3 O2 2 Al2O3 If we have 9 moles of O2, how many moles of Al2O3 would form? 9 mol O2 2 mol Al2O3 = 6 mol Al2O3 3 mol O2

  14. Your Turn! Mole to Mole! Balanced Equation: Coefficents = Moles __Co + __ F2  __CoF3 How many moles are CoF3 are produced when 1.25 moles of Co reacts?

  15. What about this?? Is it still mole to mole? Balanced Equation: Coefficents = Moles __ S8 + __ O2  __ SO2 If we start with 2.5 moles S8 how many moles of O2 are needed for S8 to fully combust?

  16. Can you step it up?? Mole to Mass Balanced Equation: Coefficents = Moles __ KCl + __ O2  __ KClO3 How many moles of KClO3 will form if we start with 64 grams of O2?

  17. Your Turn!!! Mole to Mass Balanced Equation: Coefficents = Moles NH4NO3 N2O + 2 H2O How many moles of NH4NO3 is needed to produce 25 grams of H2O?

  18. The hardest type! Mass to Mass! Balanced Equation: Coefficents = Moles __ N2 + __ H2  __ NH3 How many grams of NH3 would be produced if 56 grams of N2 are reacted?

  19. Another Example! Mass to Mass Balanced Equation: Coefficents = Moles __ Fe + __ H2O __ Fe3O4 + __ H2 How many grams of Fe3O4 will form if we start with 9 grams of H2O?

  20. More Practice Balanced Equation: Coefficents = Moles __ H2 + __ O2  __ H2O How many grams of H2O will form if we start with 3.0 moles H2?

  21. Practice, Practice, Practice…Did I mention practice? Balanced Equation: Coefficents = Moles __ Cu + __ AgNO3 __ Cu(NO3)2 + __ Ag How many grams of Ag would form if we react 8 grams AgNO3?

  22. Can you help each other step it up?? • Sage and Scribe! (if we have time) • Find a partner in the class and follow directions. • After you finish, begin HW.

  23. Exit Question • Consider the reaction: Cu + AgNO3 Ag + Cu(NO3)2 • If you start with 63.55 grams of copper (Cu), how many grams of silver (Ag) will be produced? Don’t forget to BALANCE!

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