## Delta Hº versus delta H

105169446
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### Delta Hº versus delta H

In lecture, Prof Lavelle alternates between delta H and delta Hº. Is there a difference between the two? If there is, I which situation should I use which symbol?

Bryant Vong 2G
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### Re: Delta Hº versus delta H

Delta H0 stands for the original delta H.

404975170
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### Re: Delta Hº versus delta H

I believe they are the same.

WilliamNguyen_4L
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### Re: Delta Hº versus delta H

Delta H is just the difference between the final and initial values of H. Delta Hº is the value of the difference between the final and initial values of H when the products and reactions are at standard conditions.

Daisylookinland
Posts: 46
Joined: Fri Sep 28, 2018 12:28 am

### Re: Delta Hº versus delta H

deltaH^0 refers to the standard reaction enthalpy (the rxn enthalpy when all R and P are in their standard state). DeltaH is the general symbol for the amount of heat absorbed or released. There is also deltaHf^0 which refers to the Standard Enthalpy of Formation (the standard rxn enthalpy for the formation of 1 mol of a substance).

George Ghaly 2L
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### Re: Delta Hº versus delta H

They mean the same thing, one is just referring to the initial delta H.

Kelsey Warren 1I
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### Re: Delta Hº versus delta H

Delta H naught is just delta H in standard/ideal conditions. You use them the same but one is for standard conditions.

Megan_Ervin_1F
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Joined: Fri Sep 28, 2018 12:18 am

### Re: Delta Hº versus delta H

Does this apply to all other variables as well?

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