One mole of acetone requires less heat to vaporise than 1 mol of water. Which of the two liquids has a higher enthalpy of vapourisation?
o Enthalpy of vapourisation is defined as the heat consumed by a liquid to transform into the gaseous form at a certain pressure and temperature.
o 1 mole of acetone requires less heat than 1 mole of water to vaporize. So, water consumes less heat than the same amount of acetone for vapourisation.
Hence, amongst the two liquids, water has a higher enthalpy of vapourisation (consuming higher heat energy).
Therefore, ∆Hvapourisation (water) > ∆Hvapourisation (acetone).