27. Assertion: It requires less heat to vaporise 1 mol of acetone than it does to vaporize 1 mol of water.

Reason: For an organic liquid, such as acetone, the intermolecular dipole-dipole interactions are significantly weaker.

<p><strong>27.&nbsp;</strong> (a) The magnitude of the enthalpy change depends on the strength of the intermolecular interactions in the substance undergoing the phase transformations. For example, the strong hydrogen bonds between water molecules hold them tightly in liquid phase. For an organic liquid, such as acetone, the intermolecular dipole-dipole interactions are significantly weaker. Thus, it requires less heat to vaporise 1 mol of acetone than it does to vaporize 1 mol of water.</p>

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