Delta H and Delta U

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KarineKim2L
Posts: 100
Joined: Fri Aug 30, 2019 12:16 am

Delta H and Delta U

Postby KarineKim2L » Tue Feb 11, 2020 5:20 pm

In what situations is delta H=0? Also, in what situations is delta U=0? Is delta U always 0 in isothermal reactions?

BAlvarado_1L
Posts: 49
Joined: Thu Jul 25, 2019 12:16 am

Re: Delta H and Delta U

Postby BAlvarado_1L » Tue Feb 11, 2020 5:28 pm

For an ideal gas, in an isothermal process, ΔU=0=Q−W, so Q=W. delta H is zero for isothermal reactions with ideal gases.

jisulee1C
Posts: 149
Joined: Thu Jul 25, 2019 12:17 am

Re: Delta H and Delta U

Postby jisulee1C » Tue Feb 11, 2020 5:34 pm

Delta H would be zero if the total heat energy of the reaction is zero but remember that only in constant pressure is delta equivalent to q. Delta U is always zero in an isothermal process because the internal energy is proportional to temperature and since the temperature remains constant the change of internal energy would be zero.


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