## Calculating delta H of a reaction

Julia_Gordon_2A
Posts: 30
Joined: Wed Sep 21, 2016 2:57 pm

### Calculating delta H of a reaction

When calculating the delta H of a reaction from the delta H of formation values, are gases included in the calculation? In question 9.59, the solution shows the calculation but omits the value for O2.

Jessica Chern 1H
Posts: 22
Joined: Sat Jul 09, 2016 3:00 am

### Re: Calculating delta H of a reaction

That's because the enthalpy of formation for elements in their most stable form equals 0. O2 is the most stable form for oxygen.

904826427
Posts: 16
Joined: Wed Sep 21, 2016 2:55 pm

### Re: Calculating delta H of a reaction

Jessica Chern 1H wrote:That's because the enthalpy of formation for elements in their most stable form equals 0. O2 is the most stable form for oxygen.

Is that also with entropy and gibbs?

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