Cv and Cp

Moderators: Chem_Mod, Chem_Admin

Seohyun Park 1L
Posts: 73
Joined: Fri Sep 28, 2018 12:29 am

Cv and Cp

Postby Seohyun Park 1L » Mon Jan 28, 2019 3:50 pm

Why is Cp for a gas greater than Cv?

Posts: 17528
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 393 times

Re: Cv and Cp

Postby Chem_Mod » Mon Jan 28, 2019 4:06 pm

Unlike for constant volume, at constant pressure work isn't zero and that contributes an entire R unit more (Cp = Cv + R) using a derivation that we didn't explore in this class.

Posts: 61
Joined: Fri Sep 28, 2018 12:22 am

Re: Cv and Cp

Postby TiffanyL1G » Mon Jan 28, 2019 5:51 pm

Dr. Lavelle mentioned that for Cp you can refer to the ideal gas law PV=nRT, where the number of moles, n, and the universal gas constant, R, would remain unchanged, but the temperature, T, would increase and would, therefore, increase the overall Volume. Work is happening for Cp.

Mona El Masri 1F
Posts: 34
Joined: Fri Sep 28, 2018 12:20 am

Re: Cv and Cp

Postby Mona El Masri 1F » Mon Jan 28, 2019 9:06 pm

Cp will always be slightly greater than Cv due to work being done.

Return to “Heat Capacities, Calorimeters & Calorimetry Calculations”

Who is online

Users browsing this forum: No registered users and 1 guest