To illustrate this concept, we calculate gas-phase reaction enthalpies at various rungs of the CBH ladder using BEEF-vdW, illustrated in Fig. . The simplest approach to calculate the ∆ f H is via the total atomization energy from the BEEF-vdW energies. This approach results in a ∆ f H that deviates wildly from Fig. Types of error cancellation reactions in the CBH scheme to determine the enthalpy of formation of the 1-propyl radical using BEEF-vdW DFT energies. The reported differences in ∆ f H are with respect to the ATcT value of 118 kJ mol -1 . The value above the arrow is the reaction enthalpy and all values are reported in kJ mol -1 . The atomization reaction is not part of the CBH method.