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Calculating Atom Economy | Chemistry for Grade 10 PDF Download

How to Calculate Atom Economy

  • Along with the percentage yield, atom economy is used to analyse the efficiency of reactions
  • Most reactions produce more than one product and very often some of them are not useful
  • Atom economy studies the amount of reactants that get turned into useful products
  • It illustrates what percentage of the mass of reactants become useful products
  • It is used extensively in the analysis of systems and procedures in industries, in an effort to obtain sustainable development
  • It is also a very important analysis for economic reasons as companies prefer to use processes with higher atom economies
  • The higher the atom economy of a process then the more sustainable that process is
  • The equation for calculating atom economy is:
    Calculating Atom Economy | Chemistry for Grade 10

Solved Example

Hydrogen gas is obtained from methane in a process called steam-methane reforming. The reaction is as follows:

CH4 (g) + H2O (g) → CO (g) + 3H2 (g)
Calculate the atom economy of this reaction.

Calculating Atom Economy | Chemistry for Grade 10

Exam Tip

Unwanted byproducts can sometimes be put to use so although a low atom economy is a sign that a process is not green (sustainable) it doesn’t necessarily imply that the process is not economically viable.

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