Cv vs. Cp

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Kennedi2J
Posts: 101
Joined: Wed Sep 18, 2019 12:20 am

Cv vs. Cp

Postby Kennedi2J » Sun Feb 09, 2020 8:05 pm

I know that Cv= 3/2R and Cp=5/2R but how do know which one to use when calculating q=mCAT when it doesn't specify constant volume/pressure?

Maia_Jackson_2C
Posts: 101
Joined: Fri Aug 30, 2019 12:17 am

Re: Cv vs. Cp

Postby Maia_Jackson_2C » Sun Feb 09, 2020 8:12 pm

Usually you can tell from the context of the question whether or not there is a change in pressure or volume, but if not then I think you usually use Cv (that's what they said in the review session today but they didn't say why)

Delaney Smith 1C
Posts: 52
Joined: Thu Feb 28, 2019 12:15 am

Re: Cv vs. Cp

Postby Delaney Smith 1C » Sun Feb 09, 2020 9:02 pm

Like what Maia said above, in the review session today they said that they have almost never used Cp and only Cv. But when you are calculating, you can also check to see if the compound is a monatomic or diatomic compound. If it's monatomic then use 3/2, but if it's diatomic use 5/2.


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