## Delta H and Delta U

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

### Delta H and Delta U

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

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

### Re: Delta H and Delta U

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

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.