Molar Heat Capacity  [ENDORSED]

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Nancy Le - 1F
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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?

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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.

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