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yes, you do. the entropy increases when going from solid to liquid to gas and decreases in the opposite direction. you can use delta s= q(rev)/T. the q for a reversible reaction is equal to the enthalpy of fusion, vaporization etc. this will help you account for the entropy change during phase changes.
During a phase change, the temperature does not change but heat must still go into/leave the system in order to cause the phase change. Since heat is entering or leaving the system, the entropy will change and therefore needs to be accounted for.
Yes, both enthalpy and entropy change during a phase change, but keep in mind when simply asked is the reaction spontaneous at a given temp, you do not account for entropy or enthalpy change to get to that temp, but are only looking at the spontaneity of the phase change itself.
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