Liquid X is known to have a lower vapor pressure and lower surface tension than

Question

Liquid X is known to have a lower vapor pressure and lower surface tension than Liquid Y. Use these facts to predict the result of each experiment in the table below, if you can. experiment predicted outcome o Eventually both liquids boil, X first and then Y. O Eventually both liquids boil, Y first and then X. 40.0 mL of Liquid x are put in one sealed 5 L flask, and 40.0 mL of Liquid Y are put in another sealed 5 L flask. The pressure in each flask is slowly increased by pumping in argon gas. o Neither liquid will boil O It's impossible to predict whether eitherliquid boils without more information. O my will be greater than my Wax-coated particles carefully put onto the surface of Liquid X or Liquid Y will stay on the surface, if the particles are small enough. O my will be less than my O my will be equal to my The heaviest mass of particle mx and my that will stay on each liquid's surface without sinking is measured. o It's impossible to predict whether my or my will be greater without more information.

Explanation / Answer

If a liquid has low vapour pressure then the intermolecular forces of attraction will be more then more heat is required to seperate the molecules hence boiling point of that liquid will be high,if vapour pressure is high then the intermolecular forces of attraction are small so the boiling point of those liquids will be low.

Whereas if a liquid has low surface tension then the intermolecular forces of attraction will be less then it will have low boiling point,if it contains high surface tension then the liquid will have high boiling point.

So based on above information we cannot predict which liquid boils first either X or Y.

Surface Tension is the elastic tendency of a liquid surface which makes it to acquire the least surface area,So high surface tension liquids have high tendency to have more wax particles on it since liquid Y has more surface tension more wax particles can deposit on it.Hence mX will be less than mY.

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