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The system starts at 85C, and since you are given the standard enthalpy at 100C, you have to use 3 different types of deltaS in this problem: the change in entropy when you go from 85C to 100C, the deltaS at 100C, and then the deltaS when you go from 100C to 85C. You have to go through all these steps because you’re not given the standard entropy vaporization at 85C, but 100C.
You use these 3 different steps because we are not given standard entropy of vaporization at 85C, this is essentially making a loop, you heat the substance to 100 and calculate the entropy then while T =100C meaning it remains constant, then you calculate the change in entropy there, and finally you cool the substance back down to 85C and calculate the change in entropy for that. Finally you add all the individual values for the change in entropy to give you the overall change in entropy
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