The standard enthalpy of formation \( \left(\Delta_{f} \mathrm{H}^{...

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The standard enthalpy of formation \( \left(\Delta_{f} \mathrm{H}^{\circ}{ }_{298}\right) \) for methane, \( \mathrm{CH}_{4} \) is \( -74.9 \mathrm{~kJ} \mathrm{~mol}^{-1} \). In order to calculate the average energy given out in the formation of a \( \mathrm{C}-\mathrm{H} \) bond from this it is necessary to know which one of the following?
(a) The dissociation energy of the hydrogen molecule, \( \mathrm{H}_{2} \).
(b) The first four ionisation energies of carbon.
(c) The dissociation energy of \( \mathrm{H}_{2} \) and enthalpy and sublimation of carbon (graphite).
(d) The first four ionisation energies of carbon and electron affinity of hydrogen.
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