One mole of Ar initially at 325 K undergoes an adiabatic expansion against a pressure P external = 0 from a volume of 10.5 L to a volume of 92.0 L. Calculate the final temperature using the ideal gas law and van der Waals equations of state. Assume that Cvm = 3/2 R and the van der waals parameters for Argon are a = 1.355 dm6bar/mol2 and b = 0.0320 dm3/mol.
Correct final temperatures should come to 325 K and 324 K.