The standard enthalpy of formation $$({{\Delta }_{f}}{{H}^{o}}_{298})$$ for methane, $$C{{H}_{4}}$$ is$$-74.9\text{ }kJ\text{ }mo{{l}^{-1}}$$. 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?

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The first four ionisation energies of carbon and electron affinity of hydrogen.

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The dissociation energy of the hydrogen molecule, $${{H}_{2}}$$.

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The first four ionisation energies of carbon.

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The dissociation energy of $${{H}_{2}}$$ and enthalpy of sublimation of carbon (graphite).

1.	The standard enthalpy of formation \[({{\Delta }_{f}}{{H}^{o}}_{298})\] for methane, \[C{{H}_{4}}\] is\[-74.9\text{ }kJ\text{ }mo{{l}^{-1}}\]. 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.
Answer» D. The first four ionisation energies of carbon and electron affinity of hydrogen.

The standard enthalpy of formation \[({{\Delta }_{f}}{{H}^{o}}_{298})\] for methane, \[C{{H}_{4}}\] is\[-74.9\text{ }kJ\text{ }mo{{l}^{-1}}\]. 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?

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