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Entropy change through heating curve is similar to that of calculating enthalpy change. For phase changes, you would use Delta S= qrev/T as temperature is constant. You can calculate qrev using the enthalpy of fusion/vaporization/whatever situation is. For temperature changes, you would use Delta S= nClnT2/T1, with C being the heat capacity (either constant volume/pressure depending on the situation) of that state.
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