Cailin D.

asked • 05/01/20

How do you calculate Tb and Tf of a solution?

A solution is made by dissolving of nonelectrolyte solute in of benzene. Calculate the freezing point, and boiling point, of the solution. Constants can be found in the colligative constants.


J.R. S.

tutor
You can't calculate the Tb or Tf without knowing the amount (moles) of the non electrolyte that is dissolved. You also need to know the amount of benzene used, either volume along with density, or grams of benzene. So, there certainly is insufficient information provided to answer this question.
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05/01/20

John M.

tutor
I agree with J.R.S. You're lacking the data necessary to solve the problem.
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05/03/20

1 Expert Answer

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Nancy W. answered • 05/05/20

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The equation for the freezing point depression is ΔTf=kfm where the freezing point of benzene is 5.5ºC and the kfis 5.12°C/m. The equation for the boilinq point elevation is ΔTb=kbm where the boiling point for Benzene is 80.1°C and the kb=2.53ºC/m. The m stands for molality.

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J.R. S.

tutor
Actually the equation is ΔTf=Ikfm where I is van’t Hoff factor. You left that out of you equation. Please see my comment to the original post.
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05/05/20

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