A frictionless piston-cylinder assembly contains a saturated mixture of water at 100 oC. During the constant-pressure process, 600 kJ of heat is transferred to the surrounding air at 25 oC. As a result, part of the water vapor contained in the piston-cylinder assembly condenses. Determine: a) The entropy change of the water b) The entropy change of the air c) Whether the process is reversible, irreversible or impossible.