Entropy Video Lessons

Concept

# Problem: Which one of the following processes produces a decrease in the entropy of the system?A) boiling water to form steamB) melting ice to form waterC) mixing of two gases into one container D) freezing  water to form ice E) dissolution of solid KCl in water

###### FREE Expert Solution

We’re being asked to determine the process that produces a decrease in the entropy of the system

Recall that if:

• ΔS > 0 or ΔS = (+); entropy is increased

• ΔS < 0 or ΔS = (–); entropy is decreased

Remember that phase changes lead to a change in entropy:

Also, recall that an increase in the number of gas molecules in the reaction also leads to an increase in entropy.

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###### Problem Details

Which one of the following processes produces a decrease in the entropy of the system?

A) boiling water to form steam

B) melting ice to form water

C) mixing of two gases into one container

D) freezing  water to form ice

E) dissolution of solid KCl in water