When compared to the diffusion of the same concentration of pure xylene cyanol, does the precence of a second solute in the mixture affect eh diffusion rate of xylend cyanol? what does this tell you about the mechanism of diffusion?

Rate of diffusion depends on many factors like

In this case the diffusion rate of xylene cyanol is not affected by the presence of other solute in the mixture unless it is affecting any property of the mixture like density.  

Also, the mechanism of diffusion involves only the concentration changes of a particular substance in the solution medium.

b is the correct answer

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