## Cp and Cv

Ashley Kenney 1E
Posts: 32
Joined: Wed Nov 14, 2018 12:23 am

### Cp and Cv

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?

Vy Lu 2B
Posts: 59
Joined: Fri Sep 28, 2018 12:24 am

### Re: Cp and Cv

I believe you would have to use the ideal gas constant version that cancels out whatever unit is present in the problem.

chaggard
Posts: 37
Joined: Fri Sep 28, 2018 12:19 am

### Re: Cp and Cv

This R in this equation is in fact the ideal gas constant. Gas thermochemistry and ideal gases are intertwined

daniella_knight1I
Posts: 57
Joined: Fri Sep 28, 2018 12:18 am

### Re: Cp and Cv

The R would be the ideal gas constant since you are dealing with gases.