## Reasonable Assumptions

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

DanielleNario1A
Posts: 35
Joined: Fri Sep 28, 2018 12:24 am

### Reasonable Assumptions

Does anyone have a consolidated list of the assumptions we can make in calculations? For example how deltaU is 0 for isothermal processes

Posts: 77
Joined: Fri Sep 28, 2018 12:28 am
Been upvoted: 1 time

### Re: Reasonable Assumptions

I don't have a list but I have two assumptions :
1. When a rxn is isothermal/reversible delta S Universe = 0
2. When a rxn is irreversible delta S Surroundings = 0

Brandon_Tran_2E
Posts: 63
Joined: Fri Sep 28, 2018 12:23 am

### Re: Reasonable Assumptions

To answer the second part of your question, Delta U = 0 in isothermal systems because one of the equations Lavelle showed us is that
delta U = 3/2nR(delta T) and if there is no change in T then there is no change in U.