## isothermal system

$\Delta U=q+w$

Clement Ng
Posts: 73
Joined: Sat Jul 22, 2017 3:00 am
Been upvoted: 3 times

### isothermal system

In an isothermal system, if the change in moles is not zero, would delta U still be zero?

Clarisse Wikstrom 1H
Posts: 63
Joined: Fri Sep 29, 2017 7:05 am

### Re: isothermal system

In an isothermal system, deltaT is zero vecause the temperature is constant. For an ideal gas, deltaU=(3/2)nRdeltaT. Therefore, if deltaT=0, then deltaU=0. I believe this is only for ideal gases...

Sarah Maraach 2K
Posts: 31
Joined: Thu Jul 27, 2017 3:00 am

### Re: isothermal system

As far as isothermal systems go, I don't believe we can have a problem in which number of moles change since matter is neither created nor destroyed. However, the important part of an isothermal system is that temperature doesn't change. In this case, deltaU would be zero since our equation is dependent on change in T.

Christina Bedrosian 1B
Posts: 33
Joined: Fri Sep 29, 2017 7:05 am

### Re: isothermal system

The important part is isothermal, meaning deltaT would be 0 making deltaU 0 (since anything *0=0).