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How to calculate enthalpy of combustion?? HELP

Hi Everyone!
I need help in calculating the enthalpy of (complete) combustion theoretically of long compounds such as C20H23N7O7. I have found that when combusting compounds with nitrogen in, the product is N2.

From what I have read online:
the enthalpy of combustion = formation enthalpy of products - formation enthalpy of
reactants.

However the problem is that I don't know the enthalpy of formation of C20H23N7O7. Ive looked online everywhere and I couldn't find it. Is there a way to calculate the enthalpy of formation of this compound.
I also tried Hess's law but i still need the enthalpy of formation of the long compound. I also don't know the enthalpy of reaction

Please help me out :smile: Is there any way forward?
Any help will be greatly appreciated.

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