Molar Heat Capacity  [ENDORSED]

Moderators: Chem_Mod, Chem_Admin

Nancy Le - 1F
Posts: 52
Joined: Fri Sep 29, 2017 7:07 am

Molar Heat Capacity

Postby Nancy Le - 1F » Tue Jan 09, 2018 10:08 pm

How does having additional vibrational modes increase a molecule's molar heat capacity?

Posts: 17949
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 406 times

Re: Molar Heat Capacity  [ENDORSED]

Postby Chem_Mod » Wed Jan 10, 2018 8:22 am

The more "degrees of freedom" a molecule has (translational, rotational, vibrational, etc.) the more ways it can store energy. Heat q and work w are the two contributions to a molecule's internal energy U that we will be considering in this course. Thus, the molecule with more vibrational modes has a higher heat capacity (units of J/mol-K), that is, ability to store thermal energy (heat) per Kelvin per mol of molecules.

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

Who is online

Users browsing this forum: No registered users and 1 guest