Published by:
CGP EDU Academic Team
Published on: August 13, 2026
The standard enthalpy of formation 
at 298 K for methane, 
is 
.
The additional information required to determine the average energy for 
bond formation would be
A
The dissociation energy of 
and enthalpy of sublimation of carbon
and enthalpy of sublimation of carbon B
Latent heat of vaporization of methane
C
The first four ionization energies of carbon and electron gain enthalpy of hydrogen
D
The dissociation energy of hydrogen molecule, 
Text Solution
Verified by ExpertsThe correct answer is:
A
Carbon is found in solid state. The state of substance affects the enthalpy change.
Sublimation and 
dissociation are required for 
bond.
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