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Q.

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

answer is B.

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Detailed Solution

C+2H2 →CH4 ∆fHo=eCS→g+2 × eH-H - 4 × eC-H
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