Page "Computational chemistry" Paragraph 33
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A particularly important objective, called computational thermochemistry, is to calculate thermochemical quantities such as the enthalpy of formation to chemical accuracy.
Chemical accuracy is the accuracy required to make realistic chemical predictions and is generally considered to be 1 kcal / mol or 4 kJ / mol.
To reach that accuracy in an economic way it is necessary to use a series of post-Hartree – Fock methods and combine the results.
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