Question

How do people work out the individual bond enthalpy, and how do you work out the common bond energies?

Answer 1

You need to use a table listing common bond energies

Answer 2

there is some formula to calculate enthalpy, entropy, activation energy, do you want that equations ?? little

Answer 3

The sum of the internal energy of the system plus the product of the pressure of the gas in the system and its volume:
Hsys=Esys+PV