Cp and Cv

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

Cp and Cv

Postby Ashley Kenney 1E » 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

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

Postby Vy Lu 2B » 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.

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

Re: Cp and Cv

Postby chaggard » 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

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

Re: Cp and Cv

Postby daniella_knight1I » Tue Jan 29, 2019 11:52 am

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


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