Answer to Question #304046 in General Chemistry for gra

Question

Are the molecules that can hold the lesser number of drops the same as the molecules that look less time to evaporate?why?

Answer 1

When drops of different liquids are dropped on equal surface area, the liquid that can hold lesser number of drops takes less time to evaporate.

The one that holds more drops takes more time to evaporate.

This is due to different cohesive forces of the liquid, and therefore different surface tension.

A liquid with weakest surface tension has the weakest intermolecular forces and it take less time to evaporate.