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### Cp and Cv

Posted: Mon Jan 28, 2019 9:02 pm
The textbook and homework questions reference the constant R often when calculating heat given off by a system -- for example, the molar heat capacity of a monatomic ideal gas at constant pressure is $C_{P,m}=\frac{5}{2}R$

Is this R supposed to by the ideal gas constant and are we supposed to use the ideal gas constant for a specific unit of pressure every time rather than the unit of pressure that the problem gives?

### Re: Cp and Cv

Posted: Mon Jan 28, 2019 9:04 pm
I believe you would have to use the ideal gas constant version that cancels out whatever unit is present in the problem.

### Re: Cp and Cv

Posted: Tue Jan 29, 2019 9:43 am
This R in this equation is in fact the ideal gas constant. Gas thermochemistry and ideal gases are intertwined

### Re: Cp and Cv

Posted: Tue Jan 29, 2019 11:52 am
The R would be the ideal gas constant since you are dealing with gases.