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STOICHIAWESOME!!

STOICHIAWESOME!!. Catalyst How many grams are there in 2.3 moles of dihydrogen monoxide? How many moles are there in 325 grams of Strontium? *If you accidentally took one of the orange calculators yesterday, please return it!. A little bit of both.

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STOICHIAWESOME!!

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  1. STOICHIAWESOME!! • Catalyst • How many grams are there in 2.3 moles of dihydrogen monoxide? • How many moles are there in 325 grams of Strontium? • *If you accidentally took one of the orange calculators yesterday, please return it!

  2. A little bit of both • Problems involving mass (Grams) and number of particles (atoms/molecules) need to use 2 conversion factors ___g Y =___atoms Y ___atoms Y =___g Y

  3. Practice • You have 13 min to do the back of the homework sheet. Your goal is to make sure that EVERY group member can set up the following problems on their own. • I will be walking around quizzing members of each group on how to make the correct conversion factors • Gram-atoms worksheet • When everybody in your group can complete the problems, finish the worksheet from yesterday

  4. Let’s kick this into real life… • Us chemists use equations • This is where it gets fun!

  5. S’molar Ratio Smore Equation: How do you make a S’more? 2 GC + 1 M + 2 C1 Smore GC= Graham cracker, M= marshmallow, C= chocolate pieces

  6. 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?

  7. It’s the same thing with reactions… • Key Point #1: • You must BALANCE the equation in stoichometric problems FIRST. Then, what to what. • Otherwise, you’ll never get the right answer

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

  9. S’molar Ratio Balanced Equation: Coefficents = Moles 4 Al + 3 O2 --> 2 Al2O3 If we have 9 mols of O2, how many moles of Al2O3 would form? SECOND STEP??? Mol O2  Mol Al2O3

  10. Follow this to success • Box the two compounds you are dealing with. The others do not matter for that problem! • 4 Al + 3 O2 --> 2 Al2O3 • If we have 9 mols of O2, how many moles of Al2O3 would form? • The only way to move from one compound to another in a conversion is through a mole-to-mole ratio.

  11. S’molar Ratio Balanced Equation: Coefficents = Moles 4 Al + 3 O2 --> 2 Al2O3 If we have 9 mols of O2, how many moles of Al2O3 would form? THIRD STEP??? 9 mol O2

  12. S’molar Ratio Balanced Equation: Coefficents = Moles 4 Al + 3 O2 --> 2 Al2O3 If we have 9 mols of O2, how many moles of Al2O3 would form? 9 mol O2 mol Al2O3 mol O2 WHAT IS THE CONVERSION FACTOR???!?!?!?!?!?

  13. S’molar Ratio Balanced Equation: Coefficents = Moles 4 Al + 3 O2 --> 2 Al2O3 If we have 9 mols of O2, how many moles of Al2O3 would form? 9 mol O2 2 mol Al2O3 3 mol O2

  14. S’molar Ratio Balanced Equation: Coefficents = Moles 4 Al + 3 O2 --> 2 Al2O3 If we have 9 mols of O2, how many moles of Al2O3 would form? 9 mol O2 2 mol Al2O3 6 mol Al2O3 3 mol O2

  15. Your Turn! Balanced Equation: Coefficents = Moles __Co + __ F2 --> __CoF3 How many moles of CoF3 are produced when 1.25 mol Co reacts?

  16. Your Turn! Balanced Equation: Coefficents = Moles __ S8 + __ O2 --> __ SO2 If we start with 2.5 mol S8 how many moles of SO2 will form?

  17. Your turn-10 mins • Do the first 2 problems on today’s worksheet. • Make sure everyone in your group can do the problems! Help each other out! • If you are truly a chemistry G, you will figure out the next two.

  18. Can you step it up?? Balanced Equation: Coefficents = Moles __ KCl + __ O2 --> __ KClO3 How many moles of KClO3 will form if we start With 64 grams of O2?

  19. STEP IT UP!! Balanced Equation: Coefficents = Moles 2 KCl + 3 O2 --> 2 KClO3 How many moles of KClO3 will form if we start With 64 grams of O2? 64 g O2

  20. Exit Question • Consider the reaction: • Cu + AgNO3 Ag + Cu(NO3)2 • If 12 moles of copper undergoes this reaction, how many grams of Silver will be produced? • Don’t forget to BALANCE!

  21. Exit Question

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