2009/1/261Chapter 4.1Chemical 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?2Chemical 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.3Chemical 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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2009/1/262Chemical Equations•Balance the chemical equation for the reaction of NH3burning in oxygen gas to form nitrogen monoxide & water.5Chemical Equations•Balance the chemical equation for the reaction of C7H16burning in oxygen gas to form carbon dioxide and water.6Concept of Reaction Stoichiometry1 crust + 5 ounces of tomato sauce + 2 cups of cheese → 1 pizzaHow many pizzas can we make if we have 6 cups of cheese and enough supply of other ingredients?pizzas3pizzas?cheeseofcups2pizza1cheeseofcups6pizzas?cheeseofcups6pizzas?cheeseofcups2pizza17Concept of Reaction Stoichiometry•A balanced chemical equation is like a recipe.?HCofmoles6fromproducedbecanCOofmolesmany How 1882OH18CO16O25HC22221888