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Home > Art, Film & Photography > Stoichiometry: Atomic Weight, Law of Definite Proportions, Stoichiometry, Equivalent Weight, Atomic Mass, Chemical Equation, Limiting Reagent
Stoichiometry: Atomic Weight, Law of Definite Proportions, Stoichiometry, Equivalent Weight, Atomic Mass, Chemical Equation, Limiting Reagent

Stoichiometry: Atomic Weight, Law of Definite Proportions, Stoichiometry, Equivalent Weight, Atomic Mass, Chemical Equation, Limiting Reagent


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About the Book

Purchase includes free access to book updates online and a free trial membership in the publisher's book club where you can select from more than a million books without charge. Chapters: Atomic Weight, Law of Definite Proportions, Stoichiometry, Equivalent Weight, Atomic Mass, Chemical Equation, Limiting Reagent, Equivalent, Atom Economy, Yield, Job Plot, Conversion, Gram Atomic Mass. Excerpt: Atom economy ( atom efficiency ) describes the conversion efficiency of a chemical process in terms of all atoms involved. In an ideal chemical process, the amount of starting materials or reactants equals the amount of all products generated (see stoichiometry ) and no atom is wasted. Recent developments like high raw material (such as petrochemicals ) costs and increased sensitivity to environmental concerns have made atom economical approaches more popular. Atom economy is an important concept of green chemistry philosophy. Atom economy can be written as: % atom economy = Note that atom economy can be poor even when chemical yield is near 100 %, see for instance the Cannizzaro reaction . A Diels-Alder reaction is an example of a potentially very atom efficient reaction. On the other hand if the desired product has an enantiomer the reaction needs to be sufficiently stereoselective even when atom economy is 100 %. The Gabriel synthesis of amines is an example of extremely low atom economy, as stochiometric quantities of phthalic acid derivatives are formed. In most cases, the atom economy of the Gabriel synthesis is 50 %. Atom economy can also be adjusted if a pendant group is recoverable, for example Evans auxiliary groups. However, if this can be avoided it is more desirable, as recovery processes will never be 100 %. Atom economy can be improved upon by careful selection of starting materials and a catalyst system. Atom economy is just one way to evaluate a chemical process. Other criteria can include energy consumption, pollutants released and price. References (U...


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Product Details
  • ISBN-13: 9781155723785
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • Sub Title: Atomic Weight, Law of Definite Proportions, Stoichiometry, Equivalent Weight, Atomic Mass, Chemical Equation, Limiting Reagent
  • Width: 229 mm
  • ISBN-10: 1155723783
  • Publisher Date: 06 May 2010
  • Binding: Paperback
  • Spine Width: 3 mm
  • Weight: 95 gr


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