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A cyclohexane (c-hex) solution is prepared by fully dissolving 9.11g of a newly synthesized organic compound...

A cyclohexane (c-hex) solution is prepared by fully dissolving 9.11g of a newly synthesized organic compound in 100.g cyclohexane. The freezing point of the solution is depressed by -5.80 oC from the normal freezing point of 6.55 oC for pure cyclohexane ( Kf,c-hex= 20.0 oC kg/mol , MWc-hex = 84.0 g/mol).

(a) What is the molecular weight (molar mass) of the organic compound?

(b) What is the vapor pressure of the cyclohexane for this solution at 298K?

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This question is solved by using the simple concept of calculation of depression in freezing point and lowering of vapor pressure.

The answer is given in the image,

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