Question

Which of the following solutions will have the lowest freezing point? Input the appropriate letter. A....

Which of the following solutions will have the lowest freezing point? Input the appropriate letter.

A. 35.0 g of C2H6O2 in 250.0 g of ethanol (C2H5OH)

B. 35.0 g of C3H8O in 250.0 g of ethanol (C2H5OH)

C. 35.0 g of C4H10O in 250.0 g of ethanol (C2H5OH)

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Answer #1

The depression in freezing point Tf = Kf*m, where m is the molality of the solution and Kf is a constant.

Thus, greater the molality of the solution, greater the reduction, or the drop in freezing point.

  1. molecular weight of C2H6O2 : 50. Thus, molality of A : (35/50)*(1000/250) = 2.8m
  2. molecular weight of C3H8O : 60. Thus, molality of B : (35/60)*(1000/250) = 2.33m
  3. molecular weight of C4H10O : 74. Thus, molality of C : (35/74)*(1000/250) = 1.89m

Thus, A will have lowest freezing point.

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