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Delta Hº versus delta H

Posted: Sun Jan 27, 2019 10:47 pm
by 105169446
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?

Re: Delta Hº versus delta H

Posted: Sun Jan 27, 2019 10:48 pm
by Bryant Vong 2G
Delta H0 stands for the original delta H.

Re: Delta Hº versus delta H

Posted: Sun Jan 27, 2019 10:48 pm
by 404975170
I believe they are the same.

Re: Delta Hº versus delta H

Posted: Sun Jan 27, 2019 11:42 pm
by WilliamNguyen_4L
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.

Re: Delta Hº versus delta H

Posted: Mon Jan 28, 2019 1:27 pm
by Daisylookinland
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).

Re: Delta Hº versus delta H

Posted: Tue Jan 29, 2019 7:46 pm
by George Ghaly 2L
They mean the same thing, one is just referring to the initial delta H.

Re: Delta Hº versus delta H

Posted: Tue Jan 29, 2019 7:49 pm
by Kelsey Warren 1I
Delta H naught is just delta H in standard/ideal conditions. You use them the same but one is for standard conditions.

Re: Delta Hº versus delta H

Posted: Wed Jan 30, 2019 1:35 pm
by Megan_Ervin_1F
Does this apply to all other variables as well?