Acetylene, chemisorption binding energies

In contrast, the newer UBI-QEP formalism allows the calculation of binding energies for polyatomic molecules without bond-energy partitioning. This capability is especially applicable to symmetric polyatomic molecules, such as ethylene, acetylene and hydrazine, but can also be applied to other polyatomic molecules such as nitrous oxide [20,22]. This approach gives a value of 11.0 kcal mole for the heat of chemisorption of C2H4 on Pt(l 11) [20], which is very close to the value of 12 kcal mole previously calculated. 

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