Cv and Cp

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Cynthia Ulloa
Posts: 52
Joined: Fri Feb 23, 2018 3:02 am

Cv and Cp

Postby Cynthia Ulloa » Mon Jan 28, 2019 10:06 pm

Would it be specified when to use Cv vs Cp or vice versa? Or how would we go about when to use one over the other?

Cole Elsner 2J
Posts: 88
Joined: Fri Sep 28, 2018 12:25 am

Re: Cv and Cp

Postby Cole Elsner 2J » Mon Jan 28, 2019 10:50 pm

It will most likely be made clear whether or not it's constant pressure or constant volume. I believe the type of calorimeter will be said two, so know how to distinguish them.

EllerySchlingmann1E
Posts: 76
Joined: Fri Sep 28, 2018 12:24 am

Re: Cv and Cp

Postby EllerySchlingmann1E » Mon Jan 28, 2019 10:52 pm

Cv or Cp may be specified, but if not you want to be aware of the other factors acting on the system. Cv is molar heat capacity at constant volume, so if your system is in a sealed container, you would use that one. If your system is at constant pressure, like an open container or with a piston, you would use Cp. Hope that helps!

Olivia Young 1A
Posts: 60
Joined: Fri Sep 28, 2018 12:24 am

Re: Cv and Cp

Postby Olivia Young 1A » Mon Jan 28, 2019 11:25 pm

If Cv or Cp is not specified, it helps to know that Cv (molar heat capacity of a gas at constant volume) often uses a bomb calorimeter in which the volume remains constant and there is pressure buildup, hence the name. Cp (molar heat capacity of a gas at constant pressure) uses a constant pressure calorimeter in which the volume can change and enthalpy values are given.


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