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chem lab (webwork)

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Which of the following is NOT true of colligative properties? Colligative properties are...


A. dependent on the mass of solute present.
B. independent of the chemical identity of the solute.
C. responsible for lowering the vapor pressure of a solution versus the vapor pressure of the pure solvent.
D. dependent on the molar mass of the solute.
E. all of these are true.

i was working on this with two friends, one tried E and the other tried B and they both got the answer wrong. I thought that colligative properties depended on whether a solute was volatile verses nonvolatile and not on if it is ionic or not.

I was thinking D, but I don't have a good reason to justify this answer, since colligative properties depend on the amount in grams of a solute, but not on the molar mass of the solute, and C is true because colligative properties are responsible for lowering the vapor pressure of the pure solvent

  • chem lab (webwork) -

    The answer is A. Let me legitimitize my answer; Since you can use the freezing point depression equation to find the molar mass of the solute, the molar mass obviously has an effect on the freezing point. I think its pretty clear that C is true. B is true by the definition of a colligative property (colligative properties are dependent on the number of molecules of solute in a solution, not on the identity of the solute) I go to UCI, just did this, and got it right.

  • chem lab (webwork) -

    its not a...i just did it right now n it said INCORRECT! :(

  • chem lab (webwork) -

    No you were right. Colligative properties are not dependent on the molar mass of solute, only on the mass of solute. I'm 10000% percent sure. Trust me. Molar mass of solute...the answer is D.

  • chem lab (webwork) -

    the answer is NOT d!!...i just did it and got it wrong -__-

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