## Bond Enthalpies and Standard Enthalpies of Formation

Jorja De Jesus 2C
Posts: 121
Joined: Sat Jul 20, 2019 12:15 am

### Bond Enthalpies and Standard Enthalpies of Formation

What do you plug in to the equations for these methods if you aren't given the $\Delta H^{\circ}_{f}$ or the $\Delta H^{\circ}_{B}$ values? How do you use the equation to determine this?

sarahsalama2E
Posts: 164
Joined: Fri Aug 30, 2019 12:16 am

### Re: Bond Enthalpies and Standard Enthalpies of Formation

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
Posts: 99
Joined: Wed Sep 18, 2019 12:18 am

### Re: Bond Enthalpies and Standard Enthalpies of Formation

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.

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