Question

One mole acetone requires less heat to vapourise than 1 mole of water. Which of the two liquids has higher enthalpy of vapourisation?

Answer 1

• Enthalpy of vapourisation is defined as the heat consumed by a liquid to transform into the gaseous form at a certain pressure and temperature.
• 1 mole of acetone requires less heat than 1 mole of water to vapourize.
• Hence, amongst the two liquids, water has a higher enthalpy of vapourisation(consuming higher heat energy).

Therefore,

$△H_{\text{vapourisation}}\left(\text{Water}\right)>△H_{\text{vapourisation}}\left(\text{acetone}\right)$.