Hi, I have a practice problem in thermo that I have some difficulties with: The PVT relation for helium is given by the following equation of state: P=RT/V-b, where b=2.3*10^5 m^3/mol Through an isenthalpic (H=0) throttling process, the gas is let to expand from a pressure of 10^8 Pa at 300 K to a pressure of 10^5 Pa. Calculate the final temperature of the gas. Cp can be considered constant at a value of 5/2R. I started by using the eq. for enthalpy dH=0=CpdT + (V-T(dV/dT))dP and finding (dV/dT) from the PVT relation given which resulting in R/P Replacing R/P in the dH eq. we get: 0=CpdT + (V-T(R/P))dP Wouldn't this cancel the dP term since TR/P =V? Or should I not cancel them and just continue to integrate? I'm a bit confused and could use some help. Thank you in advance
