2015 Midterm Q4/5 A

Moderators: Chem_Mod, Chem_Admin

Posts: 51
Joined: Sat Sep 24, 2016 3:00 am

2015 Midterm Q4/5 A

Postby Yinhan_Liu_1D » Tue Feb 14, 2017 4:44 pm

We know that in this process delU=3/2 nRdelT, isothermal, so that we could use delS=q/T=-W/T=nRln(V2/V1)

But does anybody know why we can't use delS=kB*ln (V2/V1)? It gives us a very small figure, which is not the same as that calculated in nRln(V2/V1)

I would appreciate your help.

Posts: 19631
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 891 times

Re: 2015 Midterm Q4/5 A

Postby Chem_Mod » Tue Feb 14, 2017 10:05 pm

plank constant gives you the entropy of a single molecule while nR is calculateing the entropy of n moles of the molecules.

Return to “Concepts & Calculations Using Second Law of Thermodynamics”

Who is online

Users browsing this forum: No registered users and 1 guest