Absolute Entropy and Entropy Change

AP Chemistry· difficulty 2/5

What is the sign of ΔS for vaporizing water?

A
$Positive; gas has greater disorder$
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B
$Zero; same molecule$
C
$Cannot be determined$
D
$Negative; gas is more ordered$

Explanation

Liquid \to gas dramatically increases positional disorder, so ΔS > 0.

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