Energy of Phase Changes

AP Chemistry· difficulty 2/5

For a given substance, generally

A
$ΔH_vap < ΔH_fus$
B
$Both are zero$
C
$ΔH_vap > ΔH_fus$
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D
$ΔH_vap = ΔH_fus$

Explanation

Vaporizing fully separates molecules; melting only loosens them — vap requires more energy.

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