Here it is
[attachment id=0 msg=2823]

the correct  image is
[attachment id=0 msg=2825]

Here are the structures and isomers of disubstituted borazine.
[attachment id=0 msg=2831]

H (enthalpy) depends on temperature -and t is measured at temperature of 298K and one 1 atm pressure
As temperature changes enthalpy value also changes.
However temperature is path independent and depends only on  initial state and final state. Temperature is a state function.