4. a) Calculate q, w, AU, AH and AS for the process in which 2.7 mol of an ideal gas (Cp = 4.5R) initially at 350 K and and 2.00 bar undergoes a reversible adiabatic compression to double its initial pressure. b) Calculate AS for the process in which the sample of ideal gas in part a) undergoes a change from the same initial state to a final state with T = 600 K and P=4.50 bar. c) Calculate AS for the process in which 120 L of CO2, 20.0 L of Ar and 15.0 L of O2 are mixed together at a constant P of l bar and constant T of 21.2C