Q. The standard enthalpy of formation at 298 K for methane, , is - 74.8 kJ . The additional information required to determine the average energy for C—H bond formation would be:

 1430  245 AIEEEAIEEE 2008 Report Error

Solution:

Carbon is found in solid state. The state ol substance affects the enthalpy change.
Sublimation
and dissociation
are required for C—H bond