- #1
Junabes
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Hey having a bit of trouble with this one. I really don't know how to start. Think I just simply don't have the right equations or I'm using the wrong units. Hopefully you guys can help me.
Find the molar mass and the number of degrees of freedom of molecules in a gas with known heat capacities: Cv = 650 J/(KgK) and Cp=910 J/(KgK).
The equations that I can find in my book that I've been trying to figure out are :
1.Cv = (nRP)/2 where R = Gas constant and P = number of degrees of freedom. n= number of moles
2.Cp = nR(1+P/2)
3.Cp = Cv + R
Well when I first started off I simply applied the Cv formula to the value of Cv and solve for P, the number of degrees of freedom. However when I did this, i got an answer of ~156 which I can immediately tell is not correct.
I am led to believe that I'm not using the correct units for Cv and Cp as they don't solve the last equation(3) correctly.
Homework Statement
Find the molar mass and the number of degrees of freedom of molecules in a gas with known heat capacities: Cv = 650 J/(KgK) and Cp=910 J/(KgK).
Homework Equations
The equations that I can find in my book that I've been trying to figure out are :
1.Cv = (nRP)/2 where R = Gas constant and P = number of degrees of freedom. n= number of moles
2.Cp = nR(1+P/2)
3.Cp = Cv + R
The Attempt at a Solution
Well when I first started off I simply applied the Cv formula to the value of Cv and solve for P, the number of degrees of freedom. However when I did this, i got an answer of ~156 which I can immediately tell is not correct.
I am led to believe that I'm not using the correct units for Cv and Cp as they don't solve the last equation(3) correctly.
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