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What is use of Raoult’s law?

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in Food Processing Unit Operations by (110k points)
What is use of Raoult’s law?

(a) Calculate the concentration of an unknown solute

(b) Calculate the molecular mass of an unknown solute

(c) Calculate the molecular mass of an unknown solution

(d) Calculate the concentration of an unknown solution

This question was posed to me in final exam.

The origin of the question is Batch Distillation in division Distillation of Food Processing Unit Operations

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The correct answer is (b) Calculate the molecular mass of an unknown solute

Easiest explanation: Raoult’s law states that vapor pressure of a solution is equal to the sum of the vapor pressures of each volatile component if it were pure multiplied by the mole fraction of that component in the solution. Raoult’s law can be used to calculate the molecular mass of an unknown solute.

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