Chapter+4_Stoichiometry

# Chapter+4_Stoichiometry - Chapter 4.1 Chemical...

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2009/1/26 1 Chapter 4.1 Chemical Quantities (Stoichiometry) Reaction Stoichiometry The numerical relationships between chemical amounts in a reaction is called stoichiometry . Why do we study stoichiometry? --- Suppose you are a manager at Eli Lilly. The company plans to produce 1,000 lb of a certain drug next month. One of the raw materials needed is ethanol. How much ethanol do you need to order? 2 Chemical Equations Symbolic representation of a chemical reaction that shows: 1. reactants on the left and products on the right; 2. States of matter for each; 3. relative amounts of each using stoichiometric coefficients. 3 Chemical Equations Points to remember: A coefficient operates on all the atoms in the formula that follows it; Chemical formulas cannot be altered when balancing equations; No other reactants or products can be added when balancing equations; Use the smallest whole number to balance equations. 4

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2009/1/26 2 Chemical Equations Balance the chemical equation for the reaction of NH 3 burning in oxygen gas to form nitrogen monoxide & water. 5 Chemical Equations Balance the chemical equation for the reaction of C 7 H 16 burning in oxygen gas to form carbon dioxide and water. 6 Concept of Reaction Stoichiometry 1 crust + 5 ounces of tomato sauce + 2 cups of cheese 1 pizza How many pizzas can we make if we have 6 cups of cheese and enough supply of other ingredients? pizzas 3 pizzas ? cheese of cups 2 pizza 1 cheese of cups 6 pizzas ? cheese of cups 6 pizzas ? cheese of cups 2 pizza 1 7 Concept of Reaction Stoichiometry A balanced chemical equation is like a recipe. ? H C of moles 6 from produced be can CO of moles many How 18 8 2 O H 18 CO 16 O 25 H C 2 2 2 2 18 8 8