## text problem 4A.5

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

JosephineF
Posts: 49
Joined: Wed Sep 18, 2019 12:17 am

### text problem 4A.5

A piston confines 0.200 mol Ne(g) in 1.20L as 25C. The gas is allowed to expand through an additional 1.20 L against a constant pressure of 1.00 atm

How do we know that the expansion of the piston is irreversible expansion?

LBacker_2E
Posts: 104
Joined: Wed Sep 18, 2019 12:21 am
Been upvoted: 1 time

### Re: text problem 4A.5

Since the problem tells you that the system is at constant pressure, you use Pex, which is for an irreversible system.

Ryan Yee 1J
Posts: 101
Joined: Sat Aug 17, 2019 12:16 am

### Re: text problem 4A.5

For a process to be reversible, there cannot be any change in temperature or pressure in the initial and final states of the system. But since the piston confines the gas and the gas expands, then the system is irreversible because the pressure changes.