## (DeltaU)=q+w Isothermal

$\Delta U=q+w$

Jack Papciak 2F
Posts: 31
Joined: Fri Sep 29, 2017 7:06 am

### (DeltaU)=q+w Isothermal

I know that when there is no heat flow, DeltaU=w, but are there any other circumstances when an equation can be changed like that because it is isothermal or something that has a constant volume?

Angela 1K
Posts: 80
Joined: Fri Sep 29, 2017 7:05 am

### Re: (DeltaU)=q+w Isothermal

For isothermal reactions, $\Delta U=0$ and so $q=-w$

104969854
Posts: 36
Joined: Fri Sep 29, 2017 7:05 am

### Re: (DeltaU)=q+w Isothermal

At constant volume, work=0, so q=delta U
At constant Temperature, q= -w, so delta U and delta H equal 0
At constant Heat, change in heat is equal to zero, so w= delta U. Also, entropy under this condition would be 0.