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Unit VI: Stoichiometry 4. Stoichiometry of Excess Quantities

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Excess and Limiting Reactant Calculations Excess Reactant Too much to react with the other reactant

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Excess and Limiting Reactant Calculations Limiting Reactant not enough limits the amount of product

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Find the Limiting and Excess Reactants LIMITING REACTANT EXCESS REACTANT

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You are baking cakes with the Swedish Chef For 1 Cake You need: 2 cups flour; 3 eggs; 1 pound of butter; 1 cup of milk You have 18 cups of flour; 15 eggs; 6 pounds of butter; 8 cups of milk

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Ca + Br 2 CaBr 2 If 80.2 g of Ca is mixed with g of Br 2, which reactant is INXS? Step 1 Covert to moles

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Ca + Br 2 CaBr 2 If 80.2 g of Ca is mixed with g of Br 2, which reactant is INXS? Step 1 Covert to moles

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Ca + Br 2 CaBr 2 If 80.2 g of Ca is mixed with g of Br 2, which reactant is INXS? Step 2 Revisit Equation

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2Al +3Cl 2 2AlCl 3 If g of Al is mixed with 400 g of Cl 2 which reactant is in excess? Directions: 3. Whichever reactant gives you the larger mass of the product is the excess reactant 4. The reactant which is not in excess is the limiting reactant

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2Al +3Cl 2 2AlCl 3 If g of Al is mixed with 400 g of Cl 2 which reactant is in excess? Directions: 1. Pick a product 2. Calculate the mass of this product starting with each reactant (one from 108.0g Al) (one from 400.0g Cl 2 )

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2Al +3Cl 2 2AlCl 3 If g of Al is mixed with 400 g of Cl 2 which reactant is in excess?

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2Al +3Cl 2 2AlCl 3 If g of Al is mixed with 400 g of Cl 2 which reactant is in excess?

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2Al +3Cl 2 2AlCl 3 Which mass of AlCl 3 is actually formed?

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2C 2 H 6 + 7O 2 4CO 2 + 6H 2 O a. When g of C 2 H 6 is mixed with g of O 2 which reactant is in excess? b. What volume of CO 2 is produced at STP? c. What mass of water is produced? d. What mass of the excess reactant is actually reacted? e. What mass of the excess reactant is left over?

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2C 2 H 6 + 7O 2 4CO 2 + 6H 2 O a. When g of C 2 H 6 is mixed with g of O 2 which reactant is in excess? Start with C 2 H 6

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2C 2 H 6 + 7O 2 4CO 2 + 6H 2 O a. When g of C 2 H 6 is mixed with g of O 2 which reactant is in excess? Start with O 2

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2C 2 H 6 + 7O 2 4CO 2 + 6H 2 O b. What volume of CO 2 is produced at STP? Start with LR (O 2 )

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2C 2 H 6 + 7O 2 4CO 2 + 6H 2 O c. What mass of water is produced?

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2C 2 H 6 + 7O 2 4CO 2 + 6H 2 O d. What mass of the excess reactant is actually reacted?

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2C 2 H 6 + 7O 2 4CO 2 + 6H 2 O e. What mass of the excess reactant is left over?

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Hebden Do Exercises on page 133

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