A solution of the sugar mannitol (mol wt 182.2) is prepared by adding 54.66g of mannitol...

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Chemistry

A solution of the sugar mannitol (mol wt 182.2) is prepared byadding 54.66g of mannitol to 1000g of water. The vapor pressure ofpure liquid water is 2338 Pa at 20⁰C. Mannitol isnonvolatile and does not ionize in aqueous solutions.
a. Assuming that aqueous mannitol solutions behave ideally,calculate the vapor pressure lowering (the difference between thevapor pressure of pure water and that of the solution) for theabove solution at 20⁰C.
b. The observed vapor pressure lowering of the mannitol solutionabove is 12.40Pa. Calculate the activity coefficient (based on molefraction) of water in this solution.
c. Calculate the osmotic pressure of the mannitol solution ofpart (b) when it is measured against pure water and compare it withthe osmotic pressure of the ideal solution.

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4.1 Ratings (703 Votes)

Hi we have to first calculate the mole fractionsno of moles of water 1000g180 5556 molno of moles of mannitol 54661823 030 molmole fraction of water here issolution vapor pressure isVapor pressure lowering is See Answer

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