Subjective questions Question 1
a. A solution is prepared by dissolving 0.432 g of polymer of unknown structure in 140
mL of hexane. Vapor pressure of pure hexane at 30.5 kPa meanwhile the vapor
pressure of the solution at 40°C was found to decrease by 12% of that pure hexane.
Density of hexane is 659 kg/m².
i. Calculate the mole fraction (X) of the polymer in the solution.
ii.
Calculate the molar mass of the polymer.
If the solute is replaced with a same number of moles of toluene (a volatile
compound), explain the effect on the vapor pressure of the solution based on
Roult's law.

3

explanation:

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.

i think its 100.

hope this !