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Scan_Doc0020 - 3.11 The Concept of Limiting Reagent 113...

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3.11 The Concept of Limiting Reagent 113 What is the mole ratio between N2 and CuO in the balanced equation? 1mol N2 3molCuO What are the moles of N2? 1mol N2 1.14 Jll.Gl-€uO X 3 Jll.Gl-€uO = 0.380 molN 2 What mass of N2 is produced? Using the molar mass of N2 (28.02 g/mol), we can calculate the mass of N2 produced: 28.02 g N2 • 0.380 mel:-N2 X = 10.6 g N2 1mel:-N2 SEE EXERCISES 3.109 THROUGH 3.111 The amount ofaproduct formed when thelimiting reactant iscompletely consumed iscalled the theoretical yield ofthat product. InExample 3.17, 10.6grams ofnitrogen represents thetheoretical yield. This isthe maximum amount ofnitrogen thatcanbepro- duced from the quantities of reactants used. Actually, the amount of product predicted bythetheoretical yield isseldom obtained because ofsidereactions (other reactions that involve one or more of the reactants or products) and other complications. The actual yield ofproduct isoften given asapercentage ofthetheoretical yield. This iscalled the percent yield: -__:entyield is important as an indicator

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