4. A mixture of hydrogen and oxygen has a hydrogen mass fraction of 0.33 . a) Determine the difference in the entropy of the mixture between a state of 7500kPa,50C and another state of 150kPa,150C, in kJ/kgK. b) Redo this calculation assuming that the hydrogen and oxygen are contained in separate tanks at State 1 (initial state) and mix into the same tank at State 2 (final state). c) Do hydrogen and oxygen behave as ideal gases at the initial or final states, respectively