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 involves the greatest increase in entropy?
a. H2O(l, 100°C) → H2O(s, 0°C)
b. H2O(g, 100°C) → H2O(s, 0°C)
c. H2O(g, 100°C) → H2O(l, 100°C)
d. H2O(l, 100°C) → H2O(g, 100°C)
e. H2O(g, 100°C) → H2O(g, 0°C)
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