Welcome Guest Search | Active Topics |

Tag as favorite
work in enthalpy vs. internal energy
Options
Previous Topic Next Topic
Amna_5729
#1 Posted : Tuesday, July 28, 2020 1:41:23 AM
Rank: Newbie

Groups: Registered
Joined: 7/20/2020
Posts: 7

Thanks: 0 times
Was thanked: 0 time(s) in 0 post(s)
ΔH = ΔE + Δ(PV) & ΔE = q + w

What is the difference between the work in the internal energy equation and the work (Δ PV) in the enthalpy equation?
Back to top
Report?
INSTR_Katerina_102
#2 Posted : Tuesday, July 28, 2020 6:51:37 AM
Rank: Advanced Member

Groups: Registered
Joined: 6/24/2019
Posts: 250

Thanks: 0 times
Was thanked: 0 time(s) in 0 post(s)
Hi Anna,

"ΔH = ΔE + Δ(PV) & ΔE = q + w

What is the difference between the work in the internal energy equation and the work (Δ PV) in the enthalpy equation?
"

d(PV) is distinct from w in that work = -PdV

When you have d(PV) instead of PdV, the implication is that it is a change in either P or V. As a result, we cannot say that it is work for sure as you could have a constant volume and an increase in pressure.

However, when P is constant, we can have

d(PV) = PdV at constant P

And therefore

PdV = -w

Please let me know if this is unclear!

Katt
Back to top
Report?
Users browsing this topic
Guest (3)
Tag as favorite
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Clean Slate theme by Jaben Cargman (Tiny Gecko)
Powered by YAF | YAF © 2003-2009, Yet Another Forum.NET
This page was generated in 0.071 seconds.