Apentix/AP Chemistry/Unit 6: Thermodynamics/Question

AP Chemistrymediummcq1 pt

Why is the enthalpy of vaporization of water much larger than its enthalpy of fusion?

A.Vaporization must break all intermolecular forces

B.Vaporization breaks covalent bonds

C.Vaporization happens at a lower temperature

D.Steam is denser than ice

Explanation

Core Concept

Melting only loosens the lattice — molecules stay in contact. Vaporization separates molecules completely, breaking every IMF, so it costs roughly six times more energy (40.7 vs 6.01 kJ/mol).

Correct Answer

AVaporization must break all intermolecular forces

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