Final answer:
The molar entropy change when water is evaporated at its boiling point is positive, indicating that the entropy of the system increases. The thermodynamic implications include increased molecular motion and a greater number of energetically accessible states.
Step-by-step explanation:
The molar entropy change when water is evaporated at its boiling point is positive. This means that the entropy of the system increases during the process of water evaporation. The thermodynamic implications of this are that as the water molecules change from the liquid phase to the gas phase, they become more disordered and have more possible microstates. This increase in entropy is due to the increase in molecular motion and the greater number of energetically accessible states.