Bond Enthalpies and Standard Enthalpies of Formation

[Jorja De Jesus 2C]

What do you plug in to the equations for these methods if you aren't given the or the values? How do you use the equation to determine this?

[sarahsalama2E]

Typically, when these values are not given to you they are 0 (usually for naturally occurring compounds, such as the enthalpy of formation for O2 0). Or if no values are given to you, you may use delta G= delta H-TdeltaS

[ValerieChavarin 4F]

If the values are not given, you might have to use the ∆G° = ∆H° - T∆S°equation to calculate enthalpy. If not, then the value might be zero. I don't believe there should be much confusion regarding this on the final.