ΔH

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lizettelopez1F
Posts: 29
Joined: Fri Sep 28, 2018 12:19 am

ΔH

Postby lizettelopez1F » Thu Feb 07, 2019 12:38 pm

Is ΔH always equal to qp? Also, under what circumstances does ΔH=ΔU?

ian_haliburton_1f
Posts: 61
Joined: Fri Sep 28, 2018 12:24 am

Re: ΔH

Postby ian_haliburton_1f » Thu Feb 07, 2019 12:49 pm

Delta H equals qp for a system under constant pressure where the only work involved is the work of expansion. Since delta H is included for conditions in which there is usually work involved, it is more usual that delta U will equal delta H plus work.

Parth Mungra
Posts: 72
Joined: Fri Sep 28, 2018 12:28 am

Re: ΔH

Postby Parth Mungra » Thu Feb 07, 2019 12:50 pm

For most liquid and aqueous solutions (not gases) dU=dV=qp because there is no change in volume, and thus no change in expansion work. w=0 is when they are equal.


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