Ice at −10 °C (1 mol) is heated at 1 atm until it becomes steam at 110 °C. The steam is then cooled and condensed completely to liquid water at 90 °C, still at 1 atm. Taking the initial state as ice at −10 °C and the final state as liquid water at 90 °C, determine whether the overall entropy change of the system is positive, negative, or zero, and justify your answer in one sentence.