ࡱ> q` ObjbjqPqP  5::;888bbbbbdpHdddde& +SUUUUUU$^hƥHy8eydeO*d:8eSS8ed#> Name Class Date 17. The combustion of methane produces carbon dioxide and water. The chemical equation for this reaction is CH4(g) + 2O2(g) ! CO2(g) + 2H2O(g) Write the three conversion factors you would use to find the volume of carbon dioxide obtained from 1.5 L of oxygen.   12.3 Limiting Reagent and Percent Yield A limiting reagent limits the amount of product. Lesson Summary Limiting and Excess Reagents All stoichiometric calculations must be based on the limiting reagent. The limiting reagent is the reactant that determines the amount of product that can be formed by a reaction. The reaction will stop when the limiting reagent has been used up. An excess reagent is any reactant that is not completely used up in a reaction. Percent Yield The percent yield is the ratio of the actual yield to the theoretical yield expressed as a percent. The theoretical yield is the maximum amount of product that could be formed from given amounts of reactants. Actual yield is the amount of product that actually forms when the reaction is carried out in the laboratory. Actual yield can be influenced by the purity of the reactants, competing side reactions, or a loss of product during collection or transfer. After reading Lesson 12.3, answer the following questions. Limiting Reagent and Percent Yield 1. What is a limiting reagent? 2. Is the following sentence true or false? A chemical reaction stops before the limiting reagent is used up. 176 Name Class Date 3. Circle the letter of the term that correctly completes the sentence. The reactant that is not completely used up in a chemical reaction is called the . a. spectator reagentc. excess reagentb. limiting reagentd. catalyst4. If the quantities of reactants are given in units other than moles, what is the first step for determining the amount of product? a. Determine the amount of product from the given amount of limiting reagent. b. Convert each given quantity of reactant to moles. c. Identify the limiting reagent. 5. In the diagram below, which reactant is the limiting reagent and why? The chemical equation for the formation of water is 2H2 + O2 ! 2H2O      Percent Yield 6. What is the theoretical yield? 7. The amount of product that actually forms when a chemical reaction is carried out in a laboratory is called the yield. 8. Is the following sentence true or false? The actual yield is usually greater than the theoretical yield. 9. Complete the equation for the percent yield of a chemical reaction.   EMBED Equation.DSMT4  10. Describe four factors that may cause percent yields to be less than 100%. 177 Name Class Date Guided Practice Problems Answer the following questions about Practice Problem 12. This equation shows the formation of aluminum oxide. 4Al(s) + 3O2(g) ! 2Al2O3(s) a. How many moles of oxygen are required to react completely with 14.8 moles of aluminum? Analyze 1. What is the given information? 2. What is the unknown? 3. What conversion factor will you need to use? Calculate 4. Complete the solution.  EMBED Equation.DSMT4  Evaluate 5. Why does the answer have three significant figures? b. How many moles of aluminum oxide are formed when 0.78 moles of oxygen react with an excess of aluminum? Analyze 6. What information is given? 7. What information is unknown? Calculate 8. Complete the solution.  EMBED Equation.DSMT4  Evaluate 9. Why does the answer have two significant figures? 178 Name Class Date Answer the following questions about Practice Problem 26. The equation for the complete combustion of ethene (C2H4) is C2H4(g) + 3O2(g) ! 2CO2(g) + 2H2O(g) If 2.70 moles of ethene reacted with 6.30 moles of oxygen, identify the limiting reagent. Step 1. Calculate the number of moles of oxygen needed to react with 2.70 moles of ethene. Multiply by the mole ratio. EMBED Equation.DSMT4  Step 2. Compare the number of moles of oxygen needed to the number given.  O2 given is less than mol O2 needed Step 3. Identify the limiting reagent. Because mol O2 are needed to react with the 2.70 mol C2H4 and only mol O2 are available, is the limiting reagent. Answer the following questions about Practice Problem 30. When 84.8 g of iron(III) oxide reacts with an excess of carbon monoxide, iron is produced. Fe2O3(s) + 3CO(g) ! 2Fe(s) + 3CO2(g) What is the theoretical yield of iron? Step 1. Begin by finding the molar mass of Fe2O3.2 mol Fe ( g Fe/mol Fe) + 3 mol O ( g O/mol O) = g + 48.0 g = g Step 2. Calculate the number of moles of iron(III) oxide. Multiply by the mole/ mass conversion factor. EMBED Equation.DSMT4  Step 3. Find the number of moles of Fe expected. Multiply by the mole ratio. EMBED Equation.DSMT4  Step 4. Find the mass of iron that should be produced. Multiply by the mole/mass conversion factor. EMBED Equation.DSMT4   179 Name Class Date Extra Practice How many molecules of oxygen are produced by the decomposition of 1225 grams of potassium chlorate (KClO3)? 2KClO3(s) ! 2KCl(s) + 3O2(g) The equation for the combustion of carbon monoxide is 2CO(g) + O2(g) ! 2CO2(g) How many liters of oxygen are needed to burn 10 liters of carbon monoxide?  1a. How many moles of chlorine gas (Cl2) would react with 5 moles of sodium (Na) according to the following chemical equation? (Balance the equation first.) Na + Cl2 ! NaCl 1b. What mass of Na must be used to produce 29.2 g of NaCl? 180 Name Class Date  For Questions 1 8, complete each statement by writing the correct word or words. If you need help, you can go online. 12.1 The Arithmetic of Equations 1. Chemists use balanced chemical equations as a basis to calculate how much is needed or how much will be formed in a reaction. 2. A balanced chemical equation can be interpreted in terms of different quantities, including numbers of atoms, molecules, or ; mass; and . 12.2 Chemical Calculations 3. In chemical calculations, are used to convert between a given number of moles of a reactant or product to moles of a different reactant or product. 4. In a typical stoichiometric problem, the given quantity is first converted to . 5. Then, the from the balanced equation is used to calculate the number of moles of the wanted substance. 6. Finally, the moles are converted to any other unit of measurement related to the , as the problem requires. 12.3 Limiting Reagent and Percent Yield 7. 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The percent yield is a measure of the of a reaction carried out in the laboratory. Extension Fill in the missing terms in the equations below.   EMBED Equation.DSMT4   181 Name Class Date Review Conversion Factors Use what you learned about stoichiometry and conversion factors to fill in the concept map.   182 Name Class Date Review Vocabulary Answer the questions by writing the correct vocabulary term in the blanks. Then arrange the circled letters to find the hidden term. Clues Vocabulary Terms ideal amount of product involved in all stoichiometric calculations quantitative relationship between reactants and products in a balanced chemical reaction the amount of product that is measured determines the amount of product formed a measure of the efficiency of a chemical reaction leftover reactants Hidden Term: EXTENSION Write a definition for the hidden term. 183 If the problem givesmolesmolesmassmassuseuseuseuse EMBED Equation.DSMT4  EMBED Equation.DSMT4  EMBED Equation.DSMT4 to getthenthenthenmolesto getto getthengramsmolesto getgrams Mole and mass stoichiometry must have a balanced equation. 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