Slide 1 of 36 Chemistry 16.3

© Copyright Pearson Prentice Hall Slide 2 of 36 Limiting Reagent and Percent Yield If a carpenter had two tabletops and seven table legs, he could only build one four-legged table. The number of table legs is the limiting factor in the construction of four-legged tables. Similarly, in chemistry, the amount of product made in a chemical reaction may be limited by the amount of one or more of the reactants. 12.3

© Copyright Pearson Prentice Hall Limiting Reagent and Percent Yield > Slide 3 of 36 Limiting and Excess Reagents How is the amount of product in a reaction affected by an insufficient quantity of any of the reactants? 12.3

Slide 4 of 36 © Copyright Pearson Prentice Hall Limiting Reagent and Percent Yield > Limiting and Excess Reagents In a chemical reaction, an insufficient quantity of any of the reactants will limit the amount of product that forms. The limiting reagent is the reagent that determines the amount of product that can be formed by a reaction. 12.3

Slide 5 of 36 © Copyright Pearson Prentice Hall Limiting Reagent and Percent Yield > Limiting and Excess Reagents In the reaction of nitrogen and hydrogen, hydrogen is the limiting reagent. Nitrogen is the reagent that is not completely used up in the reaction. The reagent that is not used up is called the excess reagent. 12.3

Slide 6 of 36 © Copyright Pearson Prentice Hall Limiting Reagent and Percent Yield > Limiting and Excess Reagents 12.3 The Chemical Equation for the Preparation of Ammonia

© Copyright Pearson Prentice Hall Slide 7 of 36 Limiting Reagent and Percent Yield > Limiting and Excess Reagents Animation 13 Apply the limiting reagent concept to the production of iron from iron ore.

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© Copyright Pearson Prentice Hall Slide 12 of 36 Practice Problems for Sample Problem 12.7 Problem Solving Solve Problem 25 with the help of an interactive guided tutorial.

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© Copyright Pearson Prentice Hall Slide 17 of 36 Practice Problems for Sample Problem 12.8 Problem Solving Solve Problem 28 with the help of an interactive guided tutorial.

© Copyright Pearson Prentice Hall Limiting Reagent and Percent Yield > Slide 18 of 36 Percent Yield What does the percent yield of a reaction measure? 12.3

Slide 19 of 36 © Copyright Pearson Prentice Hall Limiting Reagent and Percent Yield > Percent Yield The percent yield is a measure of the efficiency of a reaction carried out in the laboratory. A batting average is actually a percent yield. 12.3

Slide 20 of 36 © Copyright Pearson Prentice Hall Limiting Reagent and Percent Yield > Percent Yield The theoretical yield is the maximum amount of product that could be formed from given amounts of reactants. In contrast, the amount of product that actually forms when the reaction is carried out in the laboratory is called the actual yield. 12.3

Slide 21 of 36 © Copyright Pearson Prentice Hall Limiting Reagent and Percent Yield > Percent Yield The percent yield is the ratio of the actual yield to the theoretical yield expressed as a percent. 12.3

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© Copyright Pearson Prentice Hall Slide 26 of 36 Practice Problems for Sample Problem 12.9 Problem Solving Solve Problem 29 with the help of an interactive guided tutorial.

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© Copyright Pearson Prentice Hall Slide 31 of 36 Practice Problems for Sample Problem Problem Solving Solve Problem 31 with the help of an interactive guided tutorial.

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