We’re being asked to predict which has the greatest entropy (ΔS) for the given reactions. 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:
Which of the following result(s) in a decrease in the entropy of the system?
I. NH3(1 atm, 298 K) → NH3(3 atm, 298 K)
II. Br2(g) → Br2(l)
III. NaBr(s) → Na+(aq) + Br-(aq)
IV. O2(g, 298 K) → O2(g, 373 K)
a. I, II
b. II only
c. I and III
d. II and III
e. III only
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