Two moles of air at 1 atm, 21.1C goes through an adiabatic device and separates into a hot stream of 0.4 moles at 1 atm, 176.3C and a cold stream of 1.6 moles at 1 atm, 17.7C, without any external work. It can be concluded that (a) the total entropy change is zero (b) the total entropy change for the process is positive c) the device violates second Law of thermodynamics d) the device violates First Thermodynamics First Law of