Liquid X is known to have a higher vapor pressure and higher viscosity than Liqu

Question

Liquid X is known to have a higher vapor pressure and higher viscosity than Liquid Y. Use these facts to predict the result of each experiment in the table below, if you can. 35.0 mL each of Liquid X and Liquid Y are poured through a funnel, and the times t_X and t_Y needed to pour each liquid through the funnel are measured. t_X will be greater than t_Y t_X will be less than t_Y t_X will be equal to t_Y It's impossible to predict whether t_X or t_Y will be greater without more information. 35.0 mL of Liquid X are put in one sealed 5 L flask, and 35.0 mL of Liquid Y are put in another sealed 5 L flask. The pressure in each flask is then slowly lowered with a vacuum pump. Eventually both liquids boil, X first and then Y. Eventually both liquids boil, Y first and then X. Neither liquid will boil It's impossible to predict whether either liquid boils without more information.

Explanation / Answer

Q1.

V = 35 mL of X ; V =35 mL of Y

since X is much more viscous, expect X to take longer, i.e. tx > ty

Q2.

The pressure depends on the volaitility, low vapor pressure --> will have low P

high vapor pressure --> will have higher P

so, from the list, we know that

X has a higher vpaor pressure, so expect

Px > Py

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