Calculating the change in entropy with constant pressure


Moderators: Chem_Mod, Chem_Admin

AtreyiMitra2L
Posts: 169
Joined: Fri Sep 29, 2017 7:03 am
Been upvoted: 1 time

Calculating the change in entropy with constant pressure

Postby AtreyiMitra2L » Fri Feb 09, 2018 2:06 pm

When the question says the reaction is occuring at constant pressure, can we use C instead of C (p,m) in our equation (change in S = nC(p,m)ln(T2/T1)? Thanks!

Joyce Lee 1C
Posts: 52
Joined: Fri Sep 29, 2017 7:03 am
Been upvoted: 1 time

Re: Calculating the change in entropy with constant pressure

Postby Joyce Lee 1C » Fri Feb 09, 2018 2:40 pm

For previous questions, C(p,m) = (5/2)R, so I assume you can just use this instead of C.
S = n(5/2)Rln(T2/T1)

Gianna Apoderado 1B
Posts: 57
Joined: Fri Sep 29, 2017 7:04 am

Re: Calculating the change in entropy with constant pressure

Postby Gianna Apoderado 1B » Fri Feb 09, 2018 8:38 pm

I would stick with using C(p,m) in that deltaS equation, which as said by Joyce, is (5/2)R at constant pressure.


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

Who is online

Users browsing this forum: No registered users and 1 guest