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. 1. The problem statement, all variables and given/known data 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). 2. Relevant 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 3. 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.