Certain wood frog can survive in colder climates than the average amphibian. Thi

Question

Certain wood frog can survive in colder climates than the average amphibian. This is due to the fact that the tissues and blood vessels of this creature contain unusually high amounts of the solute, glucose. The glucose acts as antifreeze to lower the freezing point of fluid in the tissues and blood vessels. The frog can survive in weather down to -8.0 degree C, rather than to just above 0 degree C, like his unfortunate cousins. What is the minimum molality of glucose that can lower the freezing point of water to this level? Compound Kf Freezing point MW H2O 1.86 degree C/molal 0 degree C 18 g / mol Glucose,-180 g / mol C6H12O6

Explanation / Answer

we know that

depression in freezing point dF = Kf x m

so

Fo - F = Kf x m

0+8 = 1.86 x m

m = 4.3

so the molality of glucose should be 4.3

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