The CBH approach provides a convenient way to connect the DFT data with the global thermochemical network by using accurate and independent reference ∆ f H for the adsorbates that serve as the bond-type fragments used in the reference reactions. This necessity is a limitation for many catalytic surfaces where experimental or high-level theory data is not available. However, for Pt(111) (and some other close-packed facets), there is enough experimental data available in the literature, which is summarized by Silbaugh and Campbell , to decompose all C x H y O z adsorbates into bond types using isodesmic reactions (CBH-1). It is not possible to use the lower CBH-0 rung due to inconsistencies with The various bond types in this reaction are summarized in the table for demonstration purposes and show that all bond types are perfectly balanced on both sides of the reaction. An open-source software tool is available to construct these structure-preserving reactions automatically for adsorbates . The method for calculating the ∆ f H* CH 2 CH 3 from this reference reaction is similar to the approaches described before. First, the zero-point cor-rected DFT energies are used to compute the reaction enthalpy.