Which of the following involve an increase or decrease in the entropy of the sys

Question

Which of the following involve an increase or decrease in the entropy of the system and please explain why.
a) melting a solid
b) sublimation
c)freezing
d) mixing
e) separation
f) boiling

Explanation / Answer

a, b, d and f will increase the entropy of a system. Generally, liquids have more entropy than solids and gasses have more entropy than liquids so anything that changes a state from solid -> liquid or liquid -> gas or solid -> gas will increase entrpy. a. melting of a solid - increase- a melted substance has more disorder and options than a solid, hence more entropy b) sublimation -increase - because system needs energy to go from a solid state to a gas state so there is more options of order c) freezing - NO INCREASE - freezing has more order to molecules and less options of arrangement then the liquid d) mixing- increase - mixing increases the "multiplicity" of the system, which is proportional to number of ways you can recreate this state. e) separation -NO INCREASE- because multiplicity is decreased and less options of possible molecule arrangement in a separation. More order is added to system f) boiling - increase- molecules go from a liquid to a gas. The gas molecules have more disorder and possible arrangements over a liquid So melting: from solid to liquid --->increase in entropy sublimation: from solid to gas -----> increase in entropy freezing: from liquid to solid ---------> decrease in entropy mixing: no change in entropy expected separation: no change in entropy expected boiling: from liquid to gas ------> increase in entropy

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