2. a solution of anhydrous dextrose (m.w. 180) contains 25g in 500 ml........ calculate the freezing point of the solution

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Since anhydrous dextrose is added to water to form the given solution, that means there will be a depression in the freezing point of water. Thus, instead of water being frozen at 0^OC, it will now freeze at even a lower temperature.
One can thus calculate the depression in freezing point as
where m is the molality of the solution.
On calculating the above value and subtracting it fom 0^OC, the answer to the above question can be obtained.