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The standard enthalpy of formation (Delt...

The standard enthalpy of formation `(Delta_(f)H^(@))` at `298K ` for methane `(CH_(4(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 hydrogen molecule, `H_(2)`

B

The dissociation energy of `H _ (2)` and enthalpy of sublimation of carbon

C

Latent heat of vaporization of methane

D

The first four ionization energies of carbon and electron gain enthalpy of hydrogen

Text Solution

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The correct Answer is:
B
`C = 2H_(2) to CH_(4)`
`Delta_(f) H^(@) = [eC (s to g) + 2 xx e_(H - H) - 4 xx e_(C - H)]`
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