You are responsible for the purchase of oxygen gas which, before use, will be stored at a pressure of 200 atm at 300 k in a cylindrical vessel of diameter 0.2 m and height 2 m. would you prefer that the gas behaved ideally or as a van der waals fluid? the van der waals constants for oxygen are a = 1.36 liters2 · atm· mole– 2 and b = 0.0318 liters/mole.

Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?