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The standard enthalpy of formation (Delt...

The standard enthalpy of formation (`DeltaH_(f)^(@))` at `398` K fir methane , `CH_(4(g))` is `748 KJ mol^(-1)`. The additional information required to determine the average energy for `C-H` bond formation would be :

A

the dissociation energy of `H_(2)` and enthalpy fo sublimation of carbon

B

latent heat of vapourisation of methane

C

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

D

the dissociation energy of hydrogen molecule , `H_(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
`C=2H_(2) rarr CH_(4), DeltaH^(@) = -74.8 KJ mol^(-1)`
In order to calculate average energy for C-H bond formation we should know the following data. `C("graphite") rarr C(g), DeltaH, `=enthalpy of sublimation of carbon
`H_(2)(g) rarr 2H(g) , DeltaH^(@)` bond dissociation energy of `H_(2)`
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