The standard enthalpy of formation ∆fHo at 298 K for methane, CH4g, is -74.8 kJ mol-1. The additional information required to determine the average energy for C-H bond formation would be
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a
The dissociation energy of hydrogen molecule, H2
b
The dissociation energy of H2 and enthalpy of sublimation of carbon
c
Latent heat of vaporisation of methane
d
The first four ionisation energies of carbon and electron gain enthalpy of hydrogen