What is mole fraction solubility?

jayadds

As asked above, what is mole fraction solubility? From what I've been taught, it is the following equation:

mole fraction solubility = (number of moles of solute)/(number of moles of solute + number of moles of solvent)

Is that even correct?

In actual fact, there's a question that deals with this problem. I've attached it for you to see. I've attempted it several times but I can't seem to reach the answer which is supposedly
8.98 x 10^-4

Many thanks.

Attached Thumbnails

 

Borek

Definition looks logical, even if it is the first time I hear about it.

And I am unable to reproduce the result as well, I got solubility almost exactly 6 times lower.

jayadds

Thank you for confirming it with me. I also had a value that was considerably lower as well. The answer may be incorrect then.