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The standard enthalpy of formation $\;(\bigtriangleup_{f}H_{298}^{o})\;$ for methane, $\;CH_{4}\;$ is $\;-74.9\;kJmol_{-1}\;$.In order to calculate the average energy given out in the formation of a C - H bond from this it is necessary to know which one of the following ?

(a) The dissociation energy of the hydrogen molecule,$\;H_{2}\;$\[\](b) The first four ionisation energies of carbon\[\](c) The dissociation energy of $\;H_{2}\;$ and enthalpy of sublimation of carbon (graphite)\[\](d) The first four ionisation energies of carbon and electron affinity of hydrogen
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