Solve Reversible Expansion of Ideal Gas: q, Work, ΔU

  • #1

Homework Statement


The problem provides two paths. P1,V1,T1------->P1,V2,T3 (this is the only one i do not understand) for AN IDEAL GAS reversible expansion

Pressure---constant
Volume---not constant
Temperature---not constant

Calculate the q(rev)=? work(rev)=? and ΔU=?

Homework Equations





The Attempt at a Solution



Because the pressure is constant I assumed that Cp(heat cap@ constant pressure) should be used instead of Cv (heat cap@constant volume)

so...

Work(rev)=∫Cp(T)dT however the book says use ∫Cv(T)dT why is this?

It does not make sense to me because the pressure is constant and the volume changes so why use Cv over Cp Cp=5/2*R Cv=3/2R or is the book stating that the change in volume is so small that we can still use Cv(T).

Any help would be greatly appreciated

Thank you
 
  • #2
Which book is that?
 

Suggested for: Solve Reversible Expansion of Ideal Gas: q, Work, ΔU

Replies
8
Views
997
Replies
11
Views
1K
Replies
16
Views
2K
Replies
3
Views
1K
Replies
6
Views
1K
Replies
2
Views
2K
Replies
4
Views
740
Replies
4
Views
680
Back
Top