Energies of Atomization and Ionization

The energy of atomization of a ground state molecule at 0 K, for example, methane, is the energy of the reaction 

This number is experimentally accessible and is 392,3 kcal mol (Chase et ah, 1983), 

The experimental value is 12.62 eV and is positive Cor ionization of a stable molecule. 

We are now in a position to calculate the energy change of any reaction in the gaseous state at 0 K 

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Calculate E(, G2] for the methyl cation CHj. Check your result against the value used in the section on energies of atomization and ionization in this chapter. 

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