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.