The substance does not change its phase, ΔS°is largely unaffected by temperature.
At the water's boiling point,
ΔS°(liquid)-->vapor = ΔS°water,vapor -ΔS°water,liquid changes greatly as entropy of liquid water.
significantly because the entropy of water vapor is higher than that of liquid water
For instance, water at 20 °C to water at 90 °C within the phase, ΔS°(liquid)-->vapor does not change greatly even though temperature changes from 20 °C to water at 90 °C.
In conclusion, ΔS varies significantly from phase to phase but not significantly within a phase.
So long as the substance does not change its phase, ΔS° is largely unaffected by temperature.
Learn more about ΔS here:
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