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Why the standard enthalpy of vaporization(water) …

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Why the standard enthalpy of vaporization(water) is greater than standard enthalpy of vaporization(acetone)?

Posted by Sachi Chauhan 3 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Gaurav Seth 3 years, 11 months ago

Enthalpy of vaporization is the amount of energy that must be supplied to the liquid in order to change the liquid into a gas. Enthalpy is also regarded as boiling temperature of the liquid.

Acetone does not have hydrogen bond, and thus intermolecular forces are comparatively weaker which makes it boil/evaporates fast, thus reducing the molar enthalpy of vaporization. Also, Acetone does not polar O-H bond contributing to low enthalpy.

Water has non-polar region and also has strong hydrogen bond. Water has highly polar O-H bond which makes water boil at relatively higher temperature than Acetone thus has enthalpy greater than that of Acetone.

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