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The standard enthalpy of formation (ΔHf°) at 298K for methane, CH4(g) is –74.8kJ mol–1. The additional information required to determine the average energy for C – H bond formation would be
(a) the dissociation energy of H2 and enthalpy of sublimation of carbon
(b) latent heat of vaporisation of methane
(c) the first four ionisation energies of carbon and electron gain enthalpy of hydrogen
(d) the dissociation energy of hydrogen molecule, H2 .

1 Answer

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Best answer

Correct option(a) the dissociation energy of H2 and enthalpy of sublimation of carbon

Explanation:

Carbon is found in the solid state. The state of the substance affects the enthalpy change.

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Thanks sir

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