## Delta U

isochoric/isometric: $\Delta V = 0$
isothermal: $\Delta T = 0$
isobaric: $\Delta P = 0$

Carlos Gonzales 1H
Posts: 50
Joined: Fri Sep 29, 2017 7:05 am
Been upvoted: 1 time

### Delta U

Why is delta U a state function if it depends on q and w, which are not state functions?

Hubert Tang-1H
Posts: 44
Joined: Thu Jul 27, 2017 3:00 am

### Re: Delta U

delta U is the change between the initial and final values of U, meaning that the pathway it took doesn't matter, as long as any path begins and ends on the same values.

makenzie2K
Posts: 31
Joined: Fri Sep 28, 2018 12:20 am

### Re: Delta U

It is helpful to think of delta U in the sense of a graph mapping the change in reactants and products during a reaction. If you remember, Dr. Lavelle drew us an example of this to represent delta U as a state function. If a reaction takes place and ends up back at the exact same point it started in initially, the total change in position would be 0.

RachelCheung1A
Posts: 30
Joined: Fri Sep 28, 2018 12:19 am

### Re: Delta U

Delta U only requires the Final and Initial numbers of U and anything that takes place in between (the path) does not matter. Because delta U just means the change of U from the beginning to the end, it is a state function.