Heat capacity for real gas with ideal gas (zero pressure) equation
Heat capacity for real gas with ideal gas (zero pressure) equation
(OP)
I'm looking at this problem and I'm stuck.
I usually question everything but this problem is confusing me.
I don't know how they've made the jump from reduced properties (from generalized Cp charts(?)) to Cp-Cp°=1.70 cal/molK
Usually Cp-Cv=R
I've searched online and it seems Cp-Cv=ZR
This is not the same as Cp-Cp°=ZR, which would mean they've made Cp°=Cv (zero pressure so this is true?)
Has the author got the compressibility factor from the generalised compressibility chart for the Pr and Tr (Z=0.92)
I'm confused how they've made something straight forward look confusing.
Below is the problem plus the authors solution:
I usually question everything but this problem is confusing me.
I don't know how they've made the jump from reduced properties (from generalized Cp charts(?)) to Cp-Cp°=1.70 cal/molK
Usually Cp-Cv=R
I've searched online and it seems Cp-Cv=ZR
This is not the same as Cp-Cp°=ZR, which would mean they've made Cp°=Cv (zero pressure so this is true?)
Has the author got the compressibility factor from the generalised compressibility chart for the Pr and Tr (Z=0.92)
I'm confused how they've made something straight forward look confusing.
Below is the problem plus the authors solution:

RE: Heat capacity for real gas with ideal gas (zero pressure) equation
CPo means that the gas has and ideal behavior it is call specific heat at zero pressure or ideal gas... It doesn't mean that is not pressure.
Which is the source for the calculation ??? They correct the CP value for pressure but in the text has to be the source of the 1,7 value. It is done using an isothermal calculation.
Horacio
https://www.linkedin.com/company/lagotuy/
RE: Heat capacity for real gas with ideal gas (zero pressure) equation
RE: Heat capacity for real gas with ideal gas (zero pressure) equation
https://www.physicsforums.com/threads/heat-capacit...
RE: Heat capacity for real gas with ideal gas (zero pressure) equation
To answer to your query you should consider this link where you can find way to calculate Cp using Thermodynamic (EOS) and Excel.
Note : a spreadsheet is available .
https://cheguide.com/specific_heat_ratio.html
Probably people were not responsive because it seemed to be a student problem!.
Don't expect more than what you supply .
My view .
Pierre
RE: Heat capacity for real gas with ideal gas (zero pressure) equation