Delta H given

isochoric/isometric:
isothermal:
isobaric:

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505095793
Posts: 61
Joined: Fri Sep 28, 2018 12:25 am

Delta H given

Postby 505095793 » Sun Feb 17, 2019 6:07 pm

Why is it that when delta H is given in a thermodynamics question that this implies constant pressure?

Jane Burgan 1C
Posts: 73
Joined: Fri Sep 28, 2018 12:15 am

Re: Delta H given

Postby Jane Burgan 1C » Sun Feb 17, 2019 6:09 pm

Delta H is the change in enthalpy, and the definition of enthalpy is that it is heat released or absorbed under constant pressure. So, when you're given delta H you know that there's constant pressure.

Kyither Min 2K
Posts: 60
Joined: Wed Oct 03, 2018 12:15 am

Re: Delta H given

Postby Kyither Min 2K » Mon Feb 18, 2019 7:44 pm

It is because the definition of delta H is the change in enthalpy of a reaction under constant pressure. Therefore, you know when delta H is given, the reaction took place under constant pressure.


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