During which of the following processes does entropy decrease?

(A) Freezing of water to ice at
(B) Freezing of water to ice at
(C)
(D) Adsorption of CO(g) on lead surface
(E) Dissolution of NaCl i

Question

During which of the following processes does entropy decrease?

(A) Freezing of water to ice at 
(B) Freezing of water to ice at 
(C) 
(D) Adsorption of CO(g) on lead surface
(E) Dissolution of NaCl in water

Canvas Classes · Accepted Answer

Strategy:
 Entropy decreases () when a system becomes more ordered. Look for phase changes to lower energy states (gas  liquid  solid) or a decrease in the number of gaseous moles.

Step 1: Evaluate each process
- (A) & (B) Freezing: Liquid  Solid involves a loss of disorder. (Decrease)
- (C) Ammonia formation:  moles of gas react to form  moles of gas. . (Decrease)
- (D) Adsorption: Gas molecules lose their mobility upon sticking to a surface. (Decrease)
- (E) Dissolution of : Ionic solid break

More questions from Thermodynamics