Reaction Stoichiometry Weight relations in chemical reactions 1 If I react this much how much product do I get 2 If I need this much product how much do I need to react 1 If you have 200 tires how many cars can you make 1 200 2 100 3 800 4 50 2 If you have 200 tires how many motorcycles can you make 1 200 2 100 3 800 4 50 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 PbCl 2 can you make 1 5 2 10 3 2 5 How to Balance Equations One element at a time Trial and error Al Br2 Al2Br6 CH3CH2OH CH3OH O2 O2 CO2 H2O CO2 H2O General Stoichiometry Route Grams reactant Moles reactant 2 CH3OH 3 O2 amounts table Moles product 2 CO2 4 H2O If we react 100 grams of CH3OH how many grams of H2O are formed Grams product 2 H2O2 O2 2 H2O If we react 12 grams of 30 H2O2 how many grams of O2 are formed 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 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 Example 3 Which reaction is correct 2 CO g O2 g 2 CO2 g A hard OWL Question Alum Lab Calculations Let s say you start with 0 985 g Al and make 14 8 g KAl SO 4 2 12 H2O product What is the percent yield Yield actual experimental yield 100 theoretical calculated yield Molar masses Al 26 98 KAl SO 4 2 12 H2O 474 37 g mol Chemical Analysis Chemical Analysis Determining Formulas
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