Theoretical and Percent Yields

The quantity of product calculated to form when all of a limiting reactant is consumed is called the theoretical yield. The amount of product actually obtained, called the actual yield, is almost always less than (and can never be greater than) the theoretical yield. There are many reasons for this difference. Part of the reactants may not react, for example, or they may react in a way different from that desired (side reactions). In addition, it is not always possible to recover all of the product from the reaction mixture. The percent yield of a reaction relates actual and theoretical yields  

EXERCISE 3.20 Calculating Theoretical Yield and Percent Yield 

Adipic acid, H2C6H8O4, used to produce nylon, is made commercially by a reaction between cyclohexane (CgHi2) and O2  

Analyze We are given a chemical equation and the quantity of the limiting reactant (25.0 g of C5H12). We are asked to calculate the theoretical yield of a product H2C5H8O4 and the percent yield if only 33.5 g of product is obtained. 

Check We can check our answer in (a) by doing a ballpark calculation. From the balanced equation we know that each mole of cyclohexane gives 1 mol adipic acid. We have 25/84 25/75 = 0.3 mol hexane, so we expect 0.3 mol adipic acid, which equals about 

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When aluminum burns in bromine, aluminum bromide is produced. In a certain experiment, 6.0 g of aluminum was reacted with an excess of bromine to yield 50.3 g aluminum bromide. Calculate the theoretical and percent yields for this experiment. 

What experimental information do you need in order to calculate both the theoretical and percent yield of any chemical reaction (12.4)... 

Ci2H220n(aq) + H20(g) 4C2H50H(1) + 4C02(g) Determine the theoretical and percent yields of ethanol if 684 g sucrose undergoes fermentation and 349 g ethanol is obtained. 

Balance the equation and determine the theoretical and percent yields of chlorine if 86.0 g Mn02 and 50.0 g HCl react. The actual yield of chlorine is 20.0 g. 

Determine the theoretical and percent yield of hydrogen gas if 36.0 g water undergoes electrolysis to produce hydrogen and oxygen and 3.80 g hydrogen is collected. 

General Principles Use of Conversion Factors Theoretical and Percent Yield... 

QUESTION Calculate your theoretical and percent yield of Snl4 based on this equation. 

C the theoretical and actual yields are equal D the percent yield of product is more than 100%... 

Determine which of two reactants is the limiting reactant (Section 4.4). Explain the differences among actual yield, theoretical yield, and percent yield,... 

Theoretical yield, actual yield, and percent yield (page 209) ... 

Chemical Reactions in Practice Theoretical, Actual, and Percent Yields... 

Explain the reasons for lower-than-expected yields and the distinction between theoretical and actual yields, and calculate percent yield ( 3.4) (SP 3.11) (EPs 3.55-3.60, 3.63)... 

Your text talks about several sorts of "yield" when experiments are performed in the laboratory. Students often confuse these terms. Define, compare, and contrast what are meant by theoretical yield, actual yield, and percent yield. 

Making Pancakes Relationships between Ingredients 250 8.5 More Pancakes Limiting 8.7 Reactant, Theoretical Yield, and Percent Yield 257 Enthalpy A Measure of the Heat Evolved or Absorbed in a Reaction 264 ... 

More Pancakes Limiting Reactant, Theoretical Yield, and Percent Yield 257 SOLUTION... 

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