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Mass Transfer

Q1: Pick out the wrong statement.

A The mole fraction of solute is directly proportional to the molality of a 'dilute' solution.

B For a non-reacting binary mixture of ideal gases, the partial pressure distribution of both components is nonlinear in the case of steady state unimolal unidirectional diffusion.

C Azeotropes obey Raoult's law at all temperature.

D The relative volatility of a binary mixture at the azeotropic composition is 1.

ANS:C - Azeotropes obey Raoult's law at all temperature.

The wrong statement is: "The mole fraction of solute is directly proportional to the molality of a 'dilute' solution." The mole fraction of solute in a solution is not directly proportional to the molality of the solution. Instead, it is related by the equation: 𝑥solute=molality of solutemolality of solute + molality of solventxsolute​=molality of solute + molality of solventmolality of solute​ This equation shows that the mole fraction of solute depends on both the molality of the solute and the molality of the solvent. As the molality of the solvent changes, the mole fraction of solute will also change, but not necessarily in direct proportion.



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