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Reaction Stoichiometry

Learn about reaction stoichiometry, weight relations, and balancing equations in chemical reactions. Understand how to calculate product yields and determine limiting reactants. Practice with examples and calculations to enhance your chemistry skills.

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Reaction Stoichiometry

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  1. Reaction Stoichiometry Weight relations in chemical reactions: If I react this much, how much product do I get? If I need this much product, how much do I need to react

  2. 1. If you have 200 tires, how many cars can you make?1. 200 2. 100 3. 800 4. 502. If you have 200 tires, how many motorcycles can you make?1. 200 2. 100 3. 800 4. 50

  3. 3. Consider: Pb(NO3)2(aq) + 2 NaCl(aq) --> PbCl2(s) + 2 NaNO3(aq) If you have 5 moles of Pb(NO3)2, how many moles of PbCl2 can you make? 1. 5 2. 10 3. 2.5 4. Consider: Pb(NO3)2(aq) + 2 NaCl(aq) --> PbCl2(s) + 2 NaNO3(aq) If you have 5 moles of NaCl, how many moles of PbCl2 can you make? 1. 5 2. 10 3. 2.5

  4. How to Balance Equations • One element at a time • Trial and error Al + Br2 Al2Br6

  5. CH3CH2OH + O2 CO2 + H2O CH3OH + O2 CO2 + H2O

  6. General Stoichiometry Route Grams reactant Moles reactant Moles product Grams product amounts table 2 CH3OH + 3 O2 2 CO2 + 4 H2O If we react 100 grams of CH3OH, how many grams of H2O are formed?

  7. Cu(s) + 4 HNO3(aq)  Cu(NO3)2(aq) + 2 NO2(g) + 2 H2O(l)

  8. Alum Lab Calculations: Let’s say you start with 0.985 g Al and make 14.8 g KAl(SO4)212 H2O product. What is the percent yield? Molar masses: Al = 26.98; KAl(SO4)212 H2O = 474.37 g/mol

  9. Limiting Reactants 1. If you have 200 tires and 75 steering wheels, how many cars can you make? 1. 200 2. 75 3. 50 4. 100

  10. Limiting Reactants and Love

  11. Example 3. Which reaction is correct?

  12. Example 2. A cake recipe calls for 3 eggs, 2 cups of flour, and 3 teaspoons of sugar. If you have: • 9 eggs • 8 cups of flour • 12 teaspoons of sugar how many cakes can you make? Enter the number of cakes.

  13. A hard OWL Question:

  14. A hard OWL Question:

  15. Chemical Analysis

  16. Chemical Analysis: Determining Formulas 0.163 g 0.600 g Galbraith Labs

  17. 2.34 g of Ru react with CO to form 5.59 g of Ru(CO)x. What is x?

  18. Room full of people and puppies:people = 140 lbs eachpuppies = 20 lbs eachWant to know weight % of people. So, you cut off the people’s hands and find you get 44 of them.

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