Heat capacity at constant pressure vs. constant volume  [ENDORSED]

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Kayla Danesh 1F
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Joined: Thu Jul 13, 2017 2:00 am

Heat capacity at constant pressure vs. constant volume

Postby Kayla Danesh 1F » Mon Jan 15, 2018 12:04 pm

Can someone please explain to me why the molar heat capacity of an ideal gas at constant pressure is greater than that at constant volume? Thank you.

mayasinha1B
Posts: 70
Joined: Fri Sep 29, 2017 6:04 am

Re: Heat capacity at constant pressure vs. constant volume  [ENDORSED]

Postby mayasinha1B » Mon Jan 15, 2018 12:24 pm

According to my understanding, at constant volume, all the heat energy is devoted to raising the temperature of the system, and no external work is done. When the reaction takes place at a constant pressure and not a constant volume, some of the heat energy does external work by expanding the system, leaving less available energy available for raising the temperature.


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