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Mole Fraction -
It is ratio of moles of solute or moles of solvent to moles of solution.
- wherein
If a substance ‘A’ dissolves in substance ‘B’ and their number of moles are
and 
respectively; then the mole fractions of A and B are given as
Mole fraction of A = (number of moles of A)/(number of moles of solution ) =
/(
+ 
)
We have,
Option 1)
Option 2)
Option 3)
Option 4)